diff --git a/apps/android/app/src/main/java/chat/simplex/app/model/ChatModel.kt b/apps/android/app/src/main/java/chat/simplex/app/model/ChatModel.kt
index 74a5667b4..285be3e47 100644
--- a/apps/android/app/src/main/java/chat/simplex/app/model/ChatModel.kt
+++ b/apps/android/app/src/main/java/chat/simplex/app/model/ChatModel.kt
@@ -1308,6 +1308,7 @@ data class ChatItem (
       is CIContent.SndCall -> showNtfDir
       is CIContent.RcvCall -> false // notification is shown on CallInvitation instead
       is CIContent.RcvIntegrityError -> showNtfDir
+      is CIContent.RcvDecryptionError -> showNtfDir
       is CIContent.RcvGroupInvitation -> showNtfDir
       is CIContent.SndGroupInvitation -> showNtfDir
       is CIContent.RcvGroupEventContent -> when (content.rcvGroupEvent) {
@@ -1611,6 +1612,7 @@ sealed class CIContent: ItemContent {
   @Serializable @SerialName("sndCall") class SndCall(val status: CICallStatus, val duration: Int): CIContent() { override val msgContent: MsgContent? get() = null }
   @Serializable @SerialName("rcvCall") class RcvCall(val status: CICallStatus, val duration: Int): CIContent() { override val msgContent: MsgContent? get() = null }
   @Serializable @SerialName("rcvIntegrityError") class RcvIntegrityError(val msgError: MsgErrorType): CIContent() { override val msgContent: MsgContent? get() = null }
+  @Serializable @SerialName("rcvDecryptionError") class RcvDecryptionError(val msgDecryptError: MsgDecryptError, val msgCount: UInt): CIContent() { override val msgContent: MsgContent? get() = null }
   @Serializable @SerialName("rcvGroupInvitation") class RcvGroupInvitation(val groupInvitation: CIGroupInvitation, val memberRole: GroupMemberRole): CIContent() { override val msgContent: MsgContent? get() = null }
   @Serializable @SerialName("sndGroupInvitation") class SndGroupInvitation(val groupInvitation: CIGroupInvitation, val memberRole: GroupMemberRole): CIContent() { override val msgContent: MsgContent? get() = null }
   @Serializable @SerialName("rcvGroupEvent") class RcvGroupEventContent(val rcvGroupEvent: RcvGroupEvent): CIContent() { override val msgContent: MsgContent? get() = null }
@@ -1637,6 +1639,7 @@ sealed class CIContent: ItemContent {
       is SndCall -> status.text(duration)
       is RcvCall -> status.text(duration)
       is RcvIntegrityError -> msgError.text
+      is RcvDecryptionError -> msgDecryptError.text
       is RcvGroupInvitation -> groupInvitation.text
       is SndGroupInvitation -> groupInvitation.text
       is RcvGroupEventContent -> rcvGroupEvent.text
@@ -1675,6 +1678,19 @@ sealed class CIContent: ItemContent {
   }
 }
 
+@Serializable
+enum class MsgDecryptError {
+  @SerialName("ratchetHeader") RatchetHeader,
+  @SerialName("earlier") Earlier,
+  @SerialName("tooManySkipped") TooManySkipped;
+
+  val text: String get() = when (this) {
+    RatchetHeader -> generalGetString(R.string.decryption_error_permanent)
+    Earlier -> generalGetString(R.string.decryption_error)
+    TooManySkipped -> generalGetString(R.string.decryption_error_permanent)
+  }
+}
+
 @Serializable
 class CIQuote (
   val chatDir: CIDirection? = null,
diff --git a/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/CIRcvDecryptionError.kt b/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/CIRcvDecryptionError.kt
new file mode 100644
index 000000000..23960060b
--- /dev/null
+++ b/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/CIRcvDecryptionError.kt
@@ -0,0 +1,26 @@
+package chat.simplex.app.views.chat.item
+
+import androidx.compose.runtime.Composable
+import chat.simplex.app.R
+import chat.simplex.app.model.*
+import chat.simplex.app.views.helpers.AlertManager
+import chat.simplex.app.views.helpers.generalGetString
+
+@Composable
+fun CIRcvDecryptionError(msgDecryptError: MsgDecryptError, msgCount: UInt, ci: ChatItem, timedMessagesTTL: Int?, showMember: Boolean) {
+  CIMsgError(ci, timedMessagesTTL, showMember) {
+    AlertManager.shared.showAlertMsg(
+      title = generalGetString(R.string.decryption_error),
+      text = when (msgDecryptError) {
+        MsgDecryptError.RatchetHeader -> String.format(generalGetString(R.string.alert_text_decryption_error_header), msgCount) + "\n" +
+            generalGetString(R.string.alert_text_fragment_encryption_out_of_sync_old_database) + "\n" +
+            generalGetString(R.string.alert_text_fragment_permanent_error_reconnect)
+        MsgDecryptError.Earlier -> String.format(generalGetString(R.string.alert_text_decryption_error_earlier), msgCount) + "\n" +
+            generalGetString(R.string.alert_text_fragment_encryption_out_of_sync_old_database)
+        MsgDecryptError.TooManySkipped -> String.format(generalGetString(R.string.alert_text_decryption_error_too_many_skipped), msgCount) + "\n" +
+            generalGetString(R.string.alert_text_fragment_encryption_out_of_sync_old_database) + "\n" +
+            generalGetString(R.string.alert_text_fragment_permanent_error_reconnect)
+      }
+    )
+  }
+}
diff --git a/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/ChatItemView.kt b/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/ChatItemView.kt
index c8daf52bd..326c81b9f 100644
--- a/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/ChatItemView.kt
+++ b/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/ChatItemView.kt
@@ -247,7 +247,8 @@ fun ChatItemView(
         is CIContent.RcvDeleted -> DeletedItem()
         is CIContent.SndCall -> CallItem(c.status, c.duration)
         is CIContent.RcvCall -> CallItem(c.status, c.duration)
-        is CIContent.RcvIntegrityError -> IntegrityErrorItemView(cItem, cInfo.timedMessagesTTL, showMember = showMember)
+        is CIContent.RcvIntegrityError -> IntegrityErrorItemView(c.msgError, cItem, cInfo.timedMessagesTTL, showMember = showMember)
+        is CIContent.RcvDecryptionError -> CIRcvDecryptionError(c.msgDecryptError, c.msgCount, cItem, cInfo.timedMessagesTTL, showMember = showMember)
         is CIContent.RcvGroupInvitation -> CIGroupInvitationView(cItem, c.groupInvitation, c.memberRole, joinGroup = joinGroup, chatIncognito = cInfo.incognito)
         is CIContent.SndGroupInvitation -> CIGroupInvitationView(cItem, c.groupInvitation, c.memberRole, joinGroup = joinGroup, chatIncognito = cInfo.incognito)
         is CIContent.RcvGroupEventContent -> CIEventView(cItem)
diff --git a/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/IntegrityErrorItemView.kt b/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/IntegrityErrorItemView.kt
index 976e34f6c..fa25e0f88 100644
--- a/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/IntegrityErrorItemView.kt
+++ b/apps/android/app/src/main/java/chat/simplex/app/views/chat/item/IntegrityErrorItemView.kt
@@ -17,19 +17,41 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import chat.simplex.app.R
 import chat.simplex.app.model.ChatItem
+import chat.simplex.app.model.MsgErrorType
 import chat.simplex.app.ui.theme.SimpleXTheme
 import chat.simplex.app.views.helpers.AlertManager
 import chat.simplex.app.views.helpers.generalGetString
 
 @Composable
-fun IntegrityErrorItemView(ci: ChatItem, timedMessagesTTL: Int?, showMember: Boolean = false) {
+fun IntegrityErrorItemView(msgError: MsgErrorType, ci: ChatItem, timedMessagesTTL: Int?, showMember: Boolean = false) {
+  CIMsgError(ci, timedMessagesTTL, showMember) {
+    when (msgError) {
+      is MsgErrorType.MsgSkipped ->
+        AlertManager.shared.showAlertMsg(
+          title = generalGetString(R.string.alert_title_skipped_messages),
+          text = generalGetString(R.string.alert_text_skipped_messages_it_can_happen_when)
+        )
+      is MsgErrorType.MsgBadHash ->
+        AlertManager.shared.showAlertMsg(
+          title = generalGetString(R.string.alert_title_msg_bad_hash),
+          text = generalGetString(R.string.alert_text_msg_bad_hash) + "\n" +
+              generalGetString(R.string.alert_text_fragment_encryption_out_of_sync_old_database) + "\n" +
+              generalGetString(R.string.alert_text_fragment_please_report_to_developers)
+        )
+      is MsgErrorType.MsgBadId, is MsgErrorType.MsgDuplicate ->
+        AlertManager.shared.showAlertMsg(
+          title = generalGetString(R.string.alert_title_msg_bad_id),
+          text = generalGetString(R.string.alert_text_msg_bad_id) + "\n" +
+              generalGetString(R.string.alert_text_fragment_please_report_to_developers)
+        )
+    }
+  }
+}
+
+@Composable
+fun CIMsgError(ci: ChatItem, timedMessagesTTL: Int?, showMember: Boolean = false, onClick: () -> Unit) {
   Surface(
-    Modifier.clickable(onClick = {
-      AlertManager.shared.showAlertMsg(
-        title = generalGetString(R.string.alert_title_skipped_messages),
-        text = generalGetString(R.string.alert_text_skipped_messages_it_can_happen_when)
-      )
-    }),
+    Modifier.clickable(onClick = onClick),
     shape = RoundedCornerShape(18.dp),
     color = ReceivedColorLight,
   ) {
@@ -59,6 +81,7 @@ fun IntegrityErrorItemView(ci: ChatItem, timedMessagesTTL: Int?, showMember: Boo
 fun IntegrityErrorItemViewPreview() {
   SimpleXTheme {
     IntegrityErrorItemView(
+      MsgErrorType.MsgBadHash(),
       ChatItem.getDeletedContentSampleData(),
       null
     )
diff --git a/apps/android/app/src/main/res/values/strings.xml b/apps/android/app/src/main/res/values/strings.xml
index 6aa7a83b4..cd955e746 100644
--- a/apps/android/app/src/main/res/values/strings.xml
+++ b/apps/android/app/src/main/res/values/strings.xml
@@ -32,6 +32,8 @@
   <string name="moderated_description">moderated</string>
   <string name="invalid_chat">invalid chat</string>
   <string name="invalid_data">invalid data</string>
+  <string name="decryption_error_permanent">Permanent decryption error</string>
+  <string name="decryption_error">Decryption error</string>
 
   <!-- PendingContactConnection - ChatModel.kt -->
   <string name="connection_local_display_name">connection <xliff:g id="connection ID" example="1">%1$d</xliff:g></string>
@@ -741,7 +743,17 @@
   <string name="integrity_msg_bad_id">bad message ID</string>
   <string name="integrity_msg_duplicate">duplicate message</string>
   <string name="alert_title_skipped_messages">Skipped messages</string>
-  <string name="alert_text_skipped_messages_it_can_happen_when">It can happen when:\n1. The messages expire on the server if they were not received for 30 days,\n2. The server you use to receive the messages from this contact was updated and restarted.\n3. The connection is compromised.\nPlease connect to the developers via Settings to receive the updates about the servers.\nWe will be adding server redundancy to prevent lost messages.</string>
+  <string name="alert_text_skipped_messages_it_can_happen_when">It can happen when:\n1. The messages expired in the sending client after 2 days or on the server after 30 days.\n2. Message decryption failed, because you or your contact used old database backup.\n3. The connection was compromised.</string>
+  <string name="alert_title_msg_bad_hash">Bad message hash</string>
+  <string name="alert_text_msg_bad_hash">The hash of the previous message is different."</string>
+  <string name="alert_title_msg_bad_id">Bad message ID</string>
+  <string name="alert_text_msg_bad_id">The ID of the next message is incorrect (less or equal to the previous).\nIt can happen because of some bug or when the connection is compromised.</string>
+  <string name="alert_text_decryption_error_header"><xliff:g id="message count" example="1">%1$d</xliff:g> messages failed to decrypt.</string>
+  <string name="alert_text_decryption_error_earlier"><xliff:g id="message count" example="1">%1$d</xliff:g> messages failed to decrypt and won\'t be shown.</string>
+  <string name="alert_text_decryption_error_too_many_skipped"><xliff:g id="message count" example="1">%1$d</xliff:g> messages skipped.</string>
+  <string name="alert_text_fragment_encryption_out_of_sync_old_database">It can happen when you or your connection used the old database backup.</string>
+  <string name="alert_text_fragment_permanent_error_reconnect">This error is permanent for this connection, please re-connect.</string>
+  <string name="alert_text_fragment_please_report_to_developers">Please report it to the developers.</string>
 
   <!-- Privacy settings -->
   <string name="privacy_and_security">Privacy &amp; security</string>
diff --git a/apps/ios/Shared/Views/Chat/ChatItem/CIRcvDecryptionError.swift b/apps/ios/Shared/Views/Chat/ChatItem/CIRcvDecryptionError.swift
new file mode 100644
index 000000000..849196cd4
--- /dev/null
+++ b/apps/ios/Shared/Views/Chat/ChatItem/CIRcvDecryptionError.swift
@@ -0,0 +1,42 @@
+//
+//  CIRcvDecryptionError.swift
+//  SimpleX (iOS)
+//
+//  Created by Evgeny on 15/04/2023.
+//  Copyright © 2023 SimpleX Chat. All rights reserved.
+//
+
+import SwiftUI
+import SimpleXChat
+
+let decryptErrorReason: LocalizedStringKey = "It can happen when you or your connection used the old database backup."
+
+struct CIRcvDecryptionError: View {
+    var msgDecryptError: MsgDecryptError
+    var msgCount: UInt32
+    var chatItem: ChatItem
+    var showMember = false
+
+    var body: some View {
+        CIMsgError(chatItem: chatItem, showMember: showMember) {
+            var message: Text
+            let why = Text(decryptErrorReason)
+            let permanent = Text("This error is permanent for this connection, please re-connect.")
+            switch msgDecryptError {
+            case .ratchetHeader:
+                message = Text("\(msgCount) messages failed to decrypt.") + Text("\n") + why + Text("\n") + permanent
+            case .earlier:
+                message = Text("\(msgCount) messages failed to decrypt and won't be shown.") + Text("\n") + why
+            case .tooManySkipped:
+                message = Text("\(msgCount) messages skipped.") + Text("\n") + why + Text("\n") + permanent
+            }
+            AlertManager.shared.showAlert(Alert(title: Text("Decryption error"), message: message))
+        }
+    }
+}
+
+//struct CIRcvDecryptionError_Previews: PreviewProvider {
+//    static var previews: some View {
+//        CIRcvDecryptionError(msgDecryptError: .ratchetHeader, msgCount: 1, chatItem: ChatItem.getIntegrityErrorSample())
+//    }
+//}
diff --git a/apps/ios/Shared/Views/Chat/ChatItem/IntegrityErrorItemView.swift b/apps/ios/Shared/Views/Chat/ChatItem/IntegrityErrorItemView.swift
index 7a4fa4682..1ab631232 100644
--- a/apps/ios/Shared/Views/Chat/ChatItem/IntegrityErrorItemView.swift
+++ b/apps/ios/Shared/Views/Chat/ChatItem/IntegrityErrorItemView.swift
@@ -10,9 +10,53 @@ import SwiftUI
 import SimpleXChat
 
 struct IntegrityErrorItemView: View {
+    var msgError: MsgErrorType
     var chatItem: ChatItem
     var showMember = false
 
+    var body: some View {
+        CIMsgError(chatItem: chatItem, showMember: showMember) {
+            switch msgError {
+            case .msgSkipped:
+                AlertManager.shared.showAlertMsg(
+                    title: "Skipped messages",
+                    message: """
+                        It can happen when:
+                        1. The messages expired in the sending client after 2 days or on the server after 30 days.
+                        2. Message decryption failed, because you or your contact used old database backup.
+                        3. The connection was compromised.
+                        """
+                )
+            case .msgBadHash:
+                AlertManager.shared.showAlert(Alert(
+                    title: Text("Bad message hash"),
+                    message: Text("The hash of the previous message is different.") + Text("\n") +
+                        Text(decryptErrorReason) + Text("\n") +
+                        Text("Please report it to the developers.")
+                ))
+            case .msgBadId: msgBadIdAlert()
+            case .msgDuplicate: msgBadIdAlert()
+            }
+        }
+    }
+
+    private func msgBadIdAlert() {
+        AlertManager.shared.showAlert(Alert(
+            title: Text("Bad message ID"),
+            message: Text("""
+                The ID of the next message is incorrect (less or equal to the previous).
+                It can happen because of some bug or when the connection is compromised.
+                """) + Text("\n") +
+                Text("Please report it to the developers.")
+        ))
+    }
+}
+
+struct CIMsgError: View {
+    var chatItem: ChatItem
+    var showMember = false
+    var onTap: () -> Void
+
     var body: some View {
         HStack(alignment: .bottom, spacing: 0) {
             if showMember, let member = chatItem.memberDisplayName {
@@ -29,26 +73,12 @@ struct IntegrityErrorItemView: View {
         .background(Color(uiColor: .tertiarySystemGroupedBackground))
         .cornerRadius(18)
         .textSelection(.disabled)
-        .onTapGesture { skippedMessagesAlert() }
-    }
-
-    private func skippedMessagesAlert() {
-        AlertManager.shared.showAlertMsg(
-            title: "Skipped messages",
-            message: """
-                It can happen when:
-                1. The messages expire on the server if they were not received for 30 days,
-                2. The server you use to receive the messages from this contact was updated and restarted.
-                3. The connection is compromised.
-                Please connect to the developers via Settings to receive the updates about the servers.
-                We will be adding server redundancy to prevent lost messages.
-                """
-        )
+        .onTapGesture(perform: onTap)
     }
 }
 
 struct IntegrityErrorItemView_Previews: PreviewProvider {
     static var previews: some View {
-        IntegrityErrorItemView(chatItem: ChatItem.getIntegrityErrorSample())
+        IntegrityErrorItemView(msgError: .msgBadHash, chatItem: ChatItem.getIntegrityErrorSample())
     }
 }
diff --git a/apps/ios/Shared/Views/Chat/ChatItemView.swift b/apps/ios/Shared/Views/Chat/ChatItemView.swift
index 67b067f1a..82895e3f8 100644
--- a/apps/ios/Shared/Views/Chat/ChatItemView.swift
+++ b/apps/ios/Shared/Views/Chat/ChatItemView.swift
@@ -55,7 +55,8 @@ struct ChatItemContentView<Content: View>: View {
         case .rcvDeleted: deletedItemView()
         case let .sndCall(status, duration): callItemView(status, duration)
         case let .rcvCall(status, duration): callItemView(status, duration)
-        case .rcvIntegrityError: IntegrityErrorItemView(chatItem: chatItem, showMember: showMember)
+        case let .rcvIntegrityError(msgError): IntegrityErrorItemView(msgError: msgError, chatItem: chatItem, showMember: showMember)
+        case let .rcvDecryptionError(msgDecryptError, msgCount): CIRcvDecryptionError(msgDecryptError: msgDecryptError, msgCount: msgCount, chatItem: chatItem, showMember: showMember)
         case let .rcvGroupInvitation(groupInvitation, memberRole): groupInvitationItemView(groupInvitation, memberRole)
         case let .sndGroupInvitation(groupInvitation, memberRole): groupInvitationItemView(groupInvitation, memberRole)
         case .rcvGroupEvent: eventItemView()
@@ -132,6 +133,17 @@ struct ChatItemView_NonMsgContentDeleted_Previews: PreviewProvider {
                 ),
                 revealed: Binding.constant(true)
             )
+            ChatItemView(
+                chatInfo: ChatInfo.sampleData.direct,
+                chatItem: ChatItem(
+                    chatDir: .directRcv,
+                    meta: CIMeta.getSample(1, .now, "1 skipped message", .rcvRead),
+                    content: .rcvDecryptionError(msgDecryptError: .ratchetHeader, msgCount: 2),
+                    quotedItem: nil,
+                    file: nil
+                ),
+                revealed: Binding.constant(true)
+            )
             ChatItemView(
                 chatInfo: ChatInfo.sampleData.direct,
                 chatItem: ChatItem(
diff --git a/apps/ios/SimpleX.xcodeproj/project.pbxproj b/apps/ios/SimpleX.xcodeproj/project.pbxproj
index 5a65daded..e866dfef3 100644
--- a/apps/ios/SimpleX.xcodeproj/project.pbxproj
+++ b/apps/ios/SimpleX.xcodeproj/project.pbxproj
@@ -116,6 +116,7 @@
 		5CC1C99527A6CF7F000D9FF6 /* ShareSheet.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5CC1C99427A6CF7F000D9FF6 /* ShareSheet.swift */; };
 		5CC2C0FC2809BF11000C35E3 /* Localizable.strings in Resources */ = {isa = PBXBuildFile; fileRef = 5CC2C0FA2809BF11000C35E3 /* Localizable.strings */; };
 		5CC2C0FF2809BF11000C35E3 /* SimpleX--iOS--InfoPlist.strings in Resources */ = {isa = PBXBuildFile; fileRef = 5CC2C0FD2809BF11000C35E3 /* SimpleX--iOS--InfoPlist.strings */; };
+		5CC868F329EB540C0017BBFD /* CIRcvDecryptionError.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5CC868F229EB540C0017BBFD /* CIRcvDecryptionError.swift */; };
 		5CCA7DF32905735700C8FEBA /* AcceptRequestsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5CCA7DF22905735700C8FEBA /* AcceptRequestsView.swift */; };
 		5CCB939C297EFCB100399E78 /* NavStackCompat.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5CCB939B297EFCB100399E78 /* NavStackCompat.swift */; };
 		5CCD403427A5F6DF00368C90 /* AddContactView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5CCD403327A5F6DF00368C90 /* AddContactView.swift */; };
@@ -384,6 +385,7 @@
 		5CC1C99427A6CF7F000D9FF6 /* ShareSheet.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareSheet.swift; sourceTree = "<group>"; };
 		5CC2C0FB2809BF11000C35E3 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = ru; path = ru.lproj/Localizable.strings; sourceTree = "<group>"; };
 		5CC2C0FE2809BF11000C35E3 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = ru; path = "ru.lproj/SimpleX--iOS--InfoPlist.strings"; sourceTree = "<group>"; };
+		5CC868F229EB540C0017BBFD /* CIRcvDecryptionError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CIRcvDecryptionError.swift; sourceTree = "<group>"; };
 		5CCA7DF22905735700C8FEBA /* AcceptRequestsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AcceptRequestsView.swift; sourceTree = "<group>"; };
 		5CCB939B297EFCB100399E78 /* NavStackCompat.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NavStackCompat.swift; sourceTree = "<group>"; };
 		5CCD403327A5F6DF00368C90 /* AddContactView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AddContactView.swift; sourceTree = "<group>"; };
@@ -798,6 +800,7 @@
 				1841511920742C6E152E469F /* AnimatedImageView.swift */,
 				6407BA82295DA85D0082BA18 /* CIInvalidJSONView.swift */,
 				18415FD2E36F13F596A45BB4 /* CIVideoView.swift */,
+				5CC868F229EB540C0017BBFD /* CIRcvDecryptionError.swift */,
 			);
 			path = ChatItem;
 			sourceTree = "<group>";
@@ -1094,6 +1097,7 @@
 				64F1CC3B28B39D8600CD1FB1 /* IncognitoHelp.swift in Sources */,
 				5CB0BA90282713D900B3292C /* SimpleXInfo.swift in Sources */,
 				5C063D2727A4564100AEC577 /* ChatPreviewView.swift in Sources */,
+				5CC868F329EB540C0017BBFD /* CIRcvDecryptionError.swift in Sources */,
 				5C35CFCB27B2E91D00FB6C6D /* NtfManager.swift in Sources */,
 				3C8C548928133C84000A3EC7 /* PasteToConnectView.swift in Sources */,
 				5C9D13A3282187BB00AB8B43 /* WebRTC.swift in Sources */,
diff --git a/apps/ios/SimpleXChat/ChatTypes.swift b/apps/ios/SimpleXChat/ChatTypes.swift
index b05b9996c..1b33d34b2 100644
--- a/apps/ios/SimpleXChat/ChatTypes.swift
+++ b/apps/ios/SimpleXChat/ChatTypes.swift
@@ -1756,6 +1756,7 @@ public struct ChatItem: Identifiable, Decodable {
         case .sndCall: return showNtfDir
         case .rcvCall: return false // notification is shown on .callInvitation instead
         case .rcvIntegrityError: return showNtfDir
+        case .rcvDecryptionError: return showNtfDir
         case .rcvGroupInvitation: return showNtfDir
         case .sndGroupInvitation: return showNtfDir
         case .rcvGroupEvent(rcvGroupEvent: let rcvGroupEvent):
@@ -2099,6 +2100,7 @@ public enum CIContent: Decodable, ItemContent {
     case sndCall(status: CICallStatus, duration: Int)
     case rcvCall(status: CICallStatus, duration: Int)
     case rcvIntegrityError(msgError: MsgErrorType)
+    case rcvDecryptionError(msgDecryptError: MsgDecryptError, msgCount: UInt32)
     case rcvGroupInvitation(groupInvitation: CIGroupInvitation, memberRole: GroupMemberRole)
     case sndGroupInvitation(groupInvitation: CIGroupInvitation, memberRole: GroupMemberRole)
     case rcvGroupEvent(rcvGroupEvent: RcvGroupEvent)
@@ -2127,6 +2129,7 @@ public enum CIContent: Decodable, ItemContent {
             case let .sndCall(status, duration): return status.text(duration)
             case let .rcvCall(status, duration): return status.text(duration)
             case let .rcvIntegrityError(msgError): return msgError.text
+            case let .rcvDecryptionError(msgDecryptError, msgCount): return msgDecryptError.text
             case let .rcvGroupInvitation(groupInvitation, _): return groupInvitation.text
             case let .sndGroupInvitation(groupInvitation, _): return groupInvitation.text
             case let .rcvGroupEvent(rcvGroupEvent): return rcvGroupEvent.text
@@ -2173,6 +2176,20 @@ public enum CIContent: Decodable, ItemContent {
     }
 }
 
+public enum MsgDecryptError: String, Decodable {
+    case ratchetHeader
+    case earlier
+    case tooManySkipped
+
+    var text: String {
+        switch self {
+        case .ratchetHeader: return NSLocalizedString("Permanent decryption error", comment: "message decrypt error item")
+        case .earlier: return NSLocalizedString("Decryption error", comment: "message decrypt error item")
+        case .tooManySkipped: return NSLocalizedString("Permanent decryption error", comment: "message decrypt error item")
+        }
+    }
+}
+
 public struct CIQuote: Decodable, ItemContent {
     var chatDir: CIDirection?
     public var itemId: Int64?
diff --git a/cabal.project b/cabal.project
index 556f2d3fa..81e856ace 100644
--- a/cabal.project
+++ b/cabal.project
@@ -7,7 +7,7 @@ constraints: zip +disable-bzip2 +disable-zstd
 source-repository-package
     type: git
     location: https://github.com/simplex-chat/simplexmq.git
-    tag: 9f0b9a83d6dfbd926daf09883a81bf370544f48e
+    tag: 2b93e0b17d0556988885757e5b7305f6a1db65a7
 
 source-repository-package
     type: git
diff --git a/scripts/nix/sha256map.nix b/scripts/nix/sha256map.nix
index c4109cf7d..94935cac4 100644
--- a/scripts/nix/sha256map.nix
+++ b/scripts/nix/sha256map.nix
@@ -1,5 +1,5 @@
 {
-  "https://github.com/simplex-chat/simplexmq.git"."9f0b9a83d6dfbd926daf09883a81bf370544f48e" = "1pnsk2qzb10d3j7rxjqvbwirymky5d55b13y3a6mwj7qbgzzqcy9";
+  "https://github.com/simplex-chat/simplexmq.git"."2b93e0b17d0556988885757e5b7305f6a1db65a7" = "08dvvd5fgfypdrb0x9pd8f4xm4xwawbrb59k24zn7fdmg636q8ij";
   "https://github.com/simplex-chat/hs-socks.git"."a30cc7a79a08d8108316094f8f2f82a0c5e1ac51" = "0yasvnr7g91k76mjkamvzab2kvlb1g5pspjyjn2fr6v83swjhj38";
   "https://github.com/kazu-yamamoto/http2.git"."b5a1b7200cf5bc7044af34ba325284271f6dff25" = "0dqb50j57an64nf4qcf5vcz4xkd1vzvghvf8bk529c1k30r9nfzb";
   "https://github.com/simplex-chat/direct-sqlcipher.git"."34309410eb2069b029b8fc1872deb1e0db123294" = "0kwkmhyfsn2lixdlgl15smgr1h5gjk7fky6abzh8rng2h5ymnffd";
diff --git a/src/Simplex/Chat.hs b/src/Simplex/Chat.hs
index bc1e537d8..f6e82e57b 100644
--- a/src/Simplex/Chat.hs
+++ b/src/Simplex/Chat.hs
@@ -47,6 +47,7 @@ import Data.Time (NominalDiffTime, addUTCTime, defaultTimeLocale, formatTime)
 import Data.Time.Clock (UTCTime, diffUTCTime, getCurrentTime, nominalDiffTimeToSeconds)
 import Data.Time.Clock.System (SystemTime, systemToUTCTime)
 import Data.Time.LocalTime (getCurrentTimeZone, getZonedTime)
+import Data.Word (Word32)
 import qualified Database.SQLite.Simple as DB
 import Simplex.Chat.Archive
 import Simplex.Chat.Call
@@ -2630,6 +2631,19 @@ processAgentMessageConn user@User {userId} corrId agentConnId agentMessage = do
         ERR err -> do
           toView $ CRChatError (Just user) (ChatErrorAgent err $ Just connEntity)
           when (corrId /= "") $ withCompletedCommand conn agentMsg $ \_cmdData -> pure ()
+          forM_ (agentMsgDecryptError err) $ \e@(mde, n) -> do
+            ci_ <- withStore $ \db ->
+              getDirectChatItemsLast db user contactId 1 ""
+                >>= liftIO
+                  . mapM (\(ci, content') -> updateDirectChatItem' db user contactId ci content' False Nothing)
+                  . (mdeUpdatedCI e <=< headMaybe)
+            case ci_ of
+              Just ci -> toView $ CRChatItemUpdated user (AChatItem SCTDirect SMDRcv (DirectChat ct) ci)
+              _ -> createInternalChatItem user (CDDirectRcv ct) (CIRcvDecryptionError mde n) Nothing
+          where
+            headMaybe = \case
+              x : _ -> Just x
+              _ -> Nothing
         -- TODO add debugging output
         _ -> pure ()
 
@@ -2791,9 +2805,40 @@ processAgentMessageConn user@User {userId} corrId agentConnId agentMessage = do
       ERR err -> do
         toView $ CRChatError (Just user) (ChatErrorAgent err $ Just connEntity)
         when (corrId /= "") $ withCompletedCommand conn agentMsg $ \_cmdData -> pure ()
+        forM_ (agentMsgDecryptError err) $ \e@(mde, n) -> do
+          ci_ <- withStore $ \db ->
+            getGroupMemberChatItemLast db user groupId (groupMemberId' m)
+              >>= liftIO
+                . mapM (\(ci, content') -> updateGroupChatItem db user groupId ci content' False Nothing)
+                . mdeUpdatedCI e
+          case ci_ of
+            Just ci -> toView $ CRChatItemUpdated user (AChatItem SCTGroup SMDRcv (GroupChat gInfo) ci)
+            _ -> createInternalChatItem user (CDGroupRcv gInfo m) (CIRcvDecryptionError mde n) Nothing
       -- TODO add debugging output
       _ -> pure ()
 
+    agentMsgDecryptError :: AgentErrorType -> Maybe (MsgDecryptError, Word32)
+    agentMsgDecryptError = \case
+      AGENT (A_CRYPTO RATCHET_HEADER) -> Just (MDERatchetHeader, 1)
+      AGENT (A_CRYPTO (RATCHET_EARLIER n)) -> Just (MDEEarlier, n + 1) -- 1 is added to account for the message that has A_DUPLICATE error
+      AGENT (A_CRYPTO (RATCHET_SKIPPED n)) -> Just (MDETooManySkipped, n)
+      -- we are not treating this as decryption error, as in many cases it happens as the result of duplicate or redundant delivery,
+      -- and we don't have a way to differentiate.
+      -- we could store the hashes of past messages in the agent, or delaying message deletion after ACK
+      -- A_DUPLICATE -> Nothing
+      _ -> Nothing
+
+    mdeUpdatedCI :: (MsgDecryptError, Word32) -> CChatItem c -> Maybe (ChatItem c 'MDRcv, CIContent 'MDRcv)
+    mdeUpdatedCI (mde', n') (CChatItem _ ci@ChatItem {content = CIRcvDecryptionError mde n})
+      | mde == mde' = case mde of
+        MDERatchetHeader -> r (n + n')
+        MDEEarlier -> r n -- the first error in a sequence has the largest number – it's the number of messages to receive to catch up, keeping it
+        MDETooManySkipped -> r n' -- the numbers are not added as sequential MDETooManySkipped will have it incremented by 1
+      | otherwise = Nothing
+      where
+        r n'' = Just (ci, CIRcvDecryptionError mde n'')
+    mdeUpdatedCI _ _ = Nothing
+
     processSndFileConn :: ACommand 'Agent e -> ConnectionEntity -> Connection -> SndFileTransfer -> m ()
     processSndFileConn agentMsg connEntity conn ft@SndFileTransfer {fileId, fileName, fileStatus} =
       case agentMsg of
@@ -3469,9 +3514,7 @@ processAgentMessageConn user@User {userId} corrId agentConnId agentMessage = do
     checkIntegrityCreateItem :: forall c. ChatTypeI c => ChatDirection c 'MDRcv -> MsgMeta -> m ()
     checkIntegrityCreateItem cd MsgMeta {integrity, broker = (_, brokerTs)} = case integrity of
       MsgOk -> pure ()
-      MsgError e -> case e of
-        MsgSkipped {} -> createInternalChatItem user cd (CIRcvIntegrityError e) (Just brokerTs)
-        _ -> toView $ CRMsgIntegrityError user e
+      MsgError e -> createInternalChatItem user cd (CIRcvIntegrityError e) (Just brokerTs)
 
     xInfo :: Contact -> Profile -> m ()
     xInfo c@Contact {profile = p} p' = unless (fromLocalProfile p == p') $ do
diff --git a/src/Simplex/Chat/Controller.hs b/src/Simplex/Chat/Controller.hs
index 5dd604866..a437f8a7a 100644
--- a/src/Simplex/Chat/Controller.hs
+++ b/src/Simplex/Chat/Controller.hs
@@ -74,7 +74,7 @@ updateStr = "To update run: curl -o- https://raw.githubusercontent.com/simplex-c
 
 simplexmqCommitQ :: Q Exp
 simplexmqCommitQ = do
-  s <- either error B.unpack . A.parseOnly commitHashP <$> runIO (B.readFile "./cabal.project")
+  s <- either (const "") B.unpack . A.parseOnly commitHashP <$> runIO (B.readFile "./cabal.project")
   [|fromString s|]
   where
     commitHashP :: A.Parser ByteString
diff --git a/src/Simplex/Chat/Messages.hs b/src/Simplex/Chat/Messages.hs
index ad2bf2f8c..82dbcb695 100644
--- a/src/Simplex/Chat/Messages.hs
+++ b/src/Simplex/Chat/Messages.hs
@@ -29,6 +29,7 @@ import Data.Time.Clock (UTCTime, diffUTCTime, nominalDay)
 import Data.Time.LocalTime (TimeZone, ZonedTime, utcToZonedTime)
 import Data.Type.Equality
 import Data.Typeable (Typeable)
+import Data.Word (Word32)
 import Database.SQLite.Simple.FromField (FromField (..))
 import Database.SQLite.Simple.ToField (ToField (..))
 import GHC.Generics (Generic)
@@ -39,7 +40,7 @@ import Simplex.Messaging.Agent.Protocol (AgentMsgId, MsgErrorType (..), MsgMeta
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (dropPrefix, enumJSON, fromTextField_, fstToLower, singleFieldJSON, sumTypeJSON)
 import Simplex.Messaging.Protocol (MsgBody)
-import Simplex.Messaging.Util (eitherToMaybe, safeDecodeUtf8, (<$?>))
+import Simplex.Messaging.Util (eitherToMaybe, safeDecodeUtf8, tshow, (<$?>))
 
 data ChatType = CTDirect | CTGroup | CTContactRequest | CTContactConnection
   deriving (Eq, Show, Ord, Generic)
@@ -711,6 +712,7 @@ data CIContent (d :: MsgDirection) where
   CISndCall :: CICallStatus -> Int -> CIContent 'MDSnd
   CIRcvCall :: CICallStatus -> Int -> CIContent 'MDRcv
   CIRcvIntegrityError :: MsgErrorType -> CIContent 'MDRcv
+  CIRcvDecryptionError :: MsgDecryptError -> Word32 -> CIContent 'MDRcv
   CIRcvGroupInvitation :: CIGroupInvitation -> GroupMemberRole -> CIContent 'MDRcv
   CISndGroupInvitation :: CIGroupInvitation -> GroupMemberRole -> CIContent 'MDSnd
   CIRcvGroupEvent :: RcvGroupEvent -> CIContent 'MDRcv
@@ -733,6 +735,19 @@ data CIContent (d :: MsgDirection) where
 
 deriving instance Show (CIContent d)
 
+data MsgDecryptError
+  = MDERatchetHeader
+  | MDEEarlier
+  | MDETooManySkipped
+  deriving (Eq, Show, Generic)
+
+instance ToJSON MsgDecryptError where
+  toJSON = J.genericToJSON . enumJSON $ dropPrefix "MDE"
+  toEncoding = J.genericToEncoding . enumJSON $ dropPrefix "MDE"
+
+instance FromJSON MsgDecryptError where
+  parseJSON = J.genericParseJSON . enumJSON $ dropPrefix "MDE"
+
 ciRequiresAttention :: forall d. MsgDirectionI d => CIContent d -> Bool
 ciRequiresAttention content = case msgDirection @d of
   SMDSnd -> True
@@ -741,6 +756,7 @@ ciRequiresAttention content = case msgDirection @d of
     CIRcvDeleted _ -> True
     CIRcvCall {} -> True
     CIRcvIntegrityError _ -> True
+    CIRcvDecryptionError {} -> True
     CIRcvGroupInvitation {} -> True
     CIRcvGroupEvent rge -> case rge of
       RGEMemberAdded {} -> False
@@ -905,6 +921,7 @@ ciContentToText = \case
   CISndCall status duration -> "outgoing call: " <> ciCallInfoText status duration
   CIRcvCall status duration -> "incoming call: " <> ciCallInfoText status duration
   CIRcvIntegrityError err -> msgIntegrityError err
+  CIRcvDecryptionError err n -> msgDecryptErrorText err n
   CIRcvGroupInvitation groupInvitation memberRole -> "received " <> ciGroupInvitationToText groupInvitation memberRole
   CISndGroupInvitation groupInvitation memberRole -> "sent " <> ciGroupInvitationToText groupInvitation memberRole
   CIRcvGroupEvent event -> rcvGroupEventToText event
@@ -924,13 +941,22 @@ ciContentToText = \case
 
 msgIntegrityError :: MsgErrorType -> Text
 msgIntegrityError = \case
-  MsgSkipped fromId toId
-    | fromId == toId -> "1 skipped message"
-    | otherwise -> T.pack (show $ toId - fromId + 1) <> " skipped messages"
-  MsgBadId msgId -> "unexpected message ID " <> T.pack (show msgId)
+  MsgSkipped fromId toId ->
+    "skipped message ID " <> tshow fromId
+      <> if fromId == toId then "" else ".." <> tshow toId
+  MsgBadId msgId -> "unexpected message ID " <> tshow msgId
   MsgBadHash -> "incorrect message hash"
   MsgDuplicate -> "duplicate message ID"
 
+msgDecryptErrorText :: MsgDecryptError -> Word32 -> Text
+msgDecryptErrorText err n =
+  "decryption error, possibly due to the device change (" <> errName <> if n == 1 then ")" else ", " <> tshow n <> " messages)"
+  where
+    errName = case err of
+      MDERatchetHeader -> "header"
+      MDEEarlier -> "earlier message"
+      MDETooManySkipped -> "too many skipped messages"
+
 msgDirToModeratedContent_ :: SMsgDirection d -> CIContent d
 msgDirToModeratedContent_ = \case
   SMDRcv -> CIRcvModerated
@@ -968,6 +994,7 @@ data JSONCIContent
   | JCISndCall {status :: CICallStatus, duration :: Int} -- duration in seconds
   | JCIRcvCall {status :: CICallStatus, duration :: Int}
   | JCIRcvIntegrityError {msgError :: MsgErrorType}
+  | JCIRcvDecryptionError {msgDecryptError :: MsgDecryptError, msgCount :: Word32}
   | JCIRcvGroupInvitation {groupInvitation :: CIGroupInvitation, memberRole :: GroupMemberRole}
   | JCISndGroupInvitation {groupInvitation :: CIGroupInvitation, memberRole :: GroupMemberRole}
   | JCIRcvGroupEvent {rcvGroupEvent :: RcvGroupEvent}
@@ -1002,6 +1029,7 @@ jsonCIContent = \case
   CISndCall status duration -> JCISndCall {status, duration}
   CIRcvCall status duration -> JCIRcvCall {status, duration}
   CIRcvIntegrityError err -> JCIRcvIntegrityError err
+  CIRcvDecryptionError err n -> JCIRcvDecryptionError err n
   CIRcvGroupInvitation groupInvitation memberRole -> JCIRcvGroupInvitation {groupInvitation, memberRole}
   CISndGroupInvitation groupInvitation memberRole -> JCISndGroupInvitation {groupInvitation, memberRole}
   CIRcvGroupEvent rcvGroupEvent -> JCIRcvGroupEvent {rcvGroupEvent}
@@ -1028,6 +1056,7 @@ aciContentJSON = \case
   JCISndCall {status, duration} -> ACIContent SMDSnd $ CISndCall status duration
   JCIRcvCall {status, duration} -> ACIContent SMDRcv $ CIRcvCall status duration
   JCIRcvIntegrityError err -> ACIContent SMDRcv $ CIRcvIntegrityError err
+  JCIRcvDecryptionError err n -> ACIContent SMDRcv $ CIRcvDecryptionError err n
   JCIRcvGroupInvitation {groupInvitation, memberRole} -> ACIContent SMDRcv $ CIRcvGroupInvitation groupInvitation memberRole
   JCISndGroupInvitation {groupInvitation, memberRole} -> ACIContent SMDSnd $ CISndGroupInvitation groupInvitation memberRole
   JCIRcvGroupEvent {rcvGroupEvent} -> ACIContent SMDRcv $ CIRcvGroupEvent rcvGroupEvent
@@ -1054,6 +1083,7 @@ data DBJSONCIContent
   | DBJCISndCall {status :: CICallStatus, duration :: Int}
   | DBJCIRcvCall {status :: CICallStatus, duration :: Int}
   | DBJCIRcvIntegrityError {msgError :: DBMsgErrorType}
+  | DBJCIRcvDecryptionError {msgDecryptError :: MsgDecryptError, msgCount :: Word32}
   | DBJCIRcvGroupInvitation {groupInvitation :: CIGroupInvitation, memberRole :: GroupMemberRole}
   | DBJCISndGroupInvitation {groupInvitation :: CIGroupInvitation, memberRole :: GroupMemberRole}
   | DBJCIRcvGroupEvent {rcvGroupEvent :: DBRcvGroupEvent}
@@ -1088,6 +1118,7 @@ dbJsonCIContent = \case
   CISndCall status duration -> DBJCISndCall {status, duration}
   CIRcvCall status duration -> DBJCIRcvCall {status, duration}
   CIRcvIntegrityError err -> DBJCIRcvIntegrityError $ DBME err
+  CIRcvDecryptionError err n -> DBJCIRcvDecryptionError err n
   CIRcvGroupInvitation groupInvitation memberRole -> DBJCIRcvGroupInvitation {groupInvitation, memberRole}
   CISndGroupInvitation groupInvitation memberRole -> DBJCISndGroupInvitation {groupInvitation, memberRole}
   CIRcvGroupEvent rge -> DBJCIRcvGroupEvent $ RGE rge
@@ -1114,6 +1145,7 @@ aciContentDBJSON = \case
   DBJCISndCall {status, duration} -> ACIContent SMDSnd $ CISndCall status duration
   DBJCIRcvCall {status, duration} -> ACIContent SMDRcv $ CIRcvCall status duration
   DBJCIRcvIntegrityError (DBME err) -> ACIContent SMDRcv $ CIRcvIntegrityError err
+  DBJCIRcvDecryptionError err n -> ACIContent SMDRcv $ CIRcvDecryptionError err n
   DBJCIRcvGroupInvitation {groupInvitation, memberRole} -> ACIContent SMDRcv $ CIRcvGroupInvitation groupInvitation memberRole
   DBJCISndGroupInvitation {groupInvitation, memberRole} -> ACIContent SMDSnd $ CISndGroupInvitation groupInvitation memberRole
   DBJCIRcvGroupEvent (RGE rge) -> ACIContent SMDRcv $ CIRcvGroupEvent rge
diff --git a/src/Simplex/Chat/Store.hs b/src/Simplex/Chat/Store.hs
index 520dc7fa8..ffdf4382a 100644
--- a/src/Simplex/Chat/Store.hs
+++ b/src/Simplex/Chat/Store.hs
@@ -226,9 +226,11 @@ module Simplex.Chat.Store
     getDirectChatItem,
     getDirectChatItemBySharedMsgId,
     getDirectChatItemByAgentMsgId,
+    getDirectChatItemsLast,
     getGroupChatItem,
     getGroupChatItemBySharedMsgId,
     getGroupMemberCIBySharedMsgId,
+    getGroupMemberChatItemLast,
     getDirectChatItemIdByText,
     getGroupChatItemIdByText,
     getChatItemByFileId,
@@ -3929,35 +3931,36 @@ getDirectChat db user contactId pagination search_ = do
     CPBefore beforeId count -> getDirectChatBefore_ db user contactId beforeId count search
 
 getDirectChatLast_ :: DB.Connection -> User -> Int64 -> Int -> String -> ExceptT StoreError IO (Chat 'CTDirect)
-getDirectChatLast_ db user@User {userId} contactId count search = do
+getDirectChatLast_ db user contactId count search = do
   contact <- getContact db user contactId
   let stats = ChatStats {unreadCount = 0, minUnreadItemId = 0, unreadChat = False}
-  chatItems <- ExceptT getDirectChatItemsLast_
+  chatItems <- getDirectChatItemsLast db user contactId count search
   pure $ Chat (DirectChat contact) (reverse chatItems) stats
-  where
-    getDirectChatItemsLast_ :: IO (Either StoreError [CChatItem 'CTDirect])
-    getDirectChatItemsLast_ = do
-      tz <- getCurrentTimeZone
-      currentTs <- getCurrentTime
-      mapM (toDirectChatItem tz currentTs)
-        <$> DB.query
-          db
-          [sql|
-            SELECT
-              -- ChatItem
-              i.chat_item_id, i.item_ts, i.item_content, i.item_text, i.item_status, i.shared_msg_id, i.item_deleted, i.item_edited, i.created_at, i.updated_at, i.timed_ttl, i.timed_delete_at, i.item_live,
-              -- CIFile
-              f.file_id, f.file_name, f.file_size, f.file_path, f.ci_file_status, f.protocol,
-              -- DirectQuote
-              ri.chat_item_id, i.quoted_shared_msg_id, i.quoted_sent_at, i.quoted_content, i.quoted_sent
-            FROM chat_items i
-            LEFT JOIN files f ON f.chat_item_id = i.chat_item_id
-            LEFT JOIN chat_items ri ON ri.shared_msg_id = i.quoted_shared_msg_id AND ri.contact_id = i.contact_id
-            WHERE i.user_id = ? AND i.contact_id = ? AND i.item_text LIKE '%' || ? || '%'
-            ORDER BY i.chat_item_id DESC
-            LIMIT ?
-          |]
-          (userId, contactId, search, count)
+
+-- the last items in reverse order (the last item in the conversation is the first in the returned list)
+getDirectChatItemsLast :: DB.Connection -> User -> ContactId -> Int -> String -> ExceptT StoreError IO [CChatItem 'CTDirect]
+getDirectChatItemsLast db User {userId} contactId count search = ExceptT $ do
+  tz <- getCurrentTimeZone
+  currentTs <- getCurrentTime
+  mapM (toDirectChatItem tz currentTs)
+    <$> DB.query
+      db
+      [sql|
+        SELECT
+          -- ChatItem
+          i.chat_item_id, i.item_ts, i.item_content, i.item_text, i.item_status, i.shared_msg_id, i.item_deleted, i.item_edited, i.created_at, i.updated_at, i.timed_ttl, i.timed_delete_at, i.item_live,
+          -- CIFile
+          f.file_id, f.file_name, f.file_size, f.file_path, f.ci_file_status, f.protocol,
+          -- DirectQuote
+          ri.chat_item_id, i.quoted_shared_msg_id, i.quoted_sent_at, i.quoted_content, i.quoted_sent
+        FROM chat_items i
+        LEFT JOIN files f ON f.chat_item_id = i.chat_item_id
+        LEFT JOIN chat_items ri ON ri.shared_msg_id = i.quoted_shared_msg_id AND ri.contact_id = i.contact_id
+        WHERE i.user_id = ? AND i.contact_id = ? AND i.item_text LIKE '%' || ? || '%'
+        ORDER BY i.chat_item_id DESC
+        LIMIT ?
+      |]
+      (userId, contactId, search, count)
 
 getDirectChatAfter_ :: DB.Connection -> User -> Int64 -> ChatItemId -> Int -> String -> ExceptT StoreError IO (Chat 'CTDirect)
 getDirectChatAfter_ db user@User {userId} contactId afterChatItemId count search = do
@@ -4089,6 +4092,22 @@ getGroupChatLast_ db user@User {userId} groupId count search = do
           |]
           (userId, groupId, search, count)
 
+getGroupMemberChatItemLast :: DB.Connection -> User -> GroupId -> GroupMemberId -> ExceptT StoreError IO (CChatItem 'CTGroup)
+getGroupMemberChatItemLast db user@User {userId} groupId groupMemberId = do
+  chatItemId <-
+    ExceptT . firstRow fromOnly (SEChatItemNotFoundByGroupId groupId) $
+      DB.query
+        db
+        [sql|
+          SELECT chat_item_id
+          FROM chat_items
+          WHERE user_id = ? AND group_id = ? AND group_member_id = ?
+          ORDER BY item_ts DESC, chat_item_id DESC
+          LIMIT 1
+        |]
+        (userId, groupId, groupMemberId)
+  getGroupChatItem db user groupId chatItemId
+
 getGroupChatAfter_ :: DB.Connection -> User -> Int64 -> ChatItemId -> Int -> String -> ExceptT StoreError IO (Chat 'CTGroup)
 getGroupChatAfter_ db user@User {userId} groupId afterChatItemId count search = do
   groupInfo <- getGroupInfo db user groupId
diff --git a/src/Simplex/Chat/View.hs b/src/Simplex/Chat/View.hs
index 754c14fd2..3bd2ee13f 100644
--- a/src/Simplex/Chat/View.hs
+++ b/src/Simplex/Chat/View.hs
@@ -27,6 +27,7 @@ import Data.Text.Encoding (decodeLatin1)
 import Data.Time.Clock (DiffTime, UTCTime)
 import Data.Time.Format (defaultTimeLocale, formatTime)
 import Data.Time.LocalTime (ZonedTime (..), localDay, localTimeOfDay, timeOfDayToTime, utcToZonedTime)
+import Data.Word (Word32)
 import GHC.Generics (Generic)
 import qualified Network.HTTP.Types as Q
 import Numeric (showFFloat)
@@ -365,6 +366,7 @@ viewChatItem chat ci@ChatItem {chatDir, meta = meta, content, quotedItem, file}
       CIDirectRcv -> case content of
         CIRcvMsgContent mc -> withRcvFile from $ rcvMsg from quote mc
         CIRcvIntegrityError err -> viewRcvIntegrityError from err ts meta
+        CIRcvDecryptionError err n -> viewRcvDecryptionError from err n ts meta
         CIRcvGroupEvent {} -> showRcvItemProhibited from
         _ -> showRcvItem from
         where
@@ -381,6 +383,7 @@ viewChatItem chat ci@ChatItem {chatDir, meta = meta, content, quotedItem, file}
       CIGroupRcv m -> case content of
         CIRcvMsgContent mc -> withRcvFile from $ rcvMsg from quote mc
         CIRcvIntegrityError err -> viewRcvIntegrityError from err ts meta
+        CIRcvDecryptionError err n -> viewRcvDecryptionError from err n ts meta
         CIRcvGroupInvitation {} -> showRcvItemProhibited from
         _ -> showRcvItem from
         where
@@ -489,20 +492,14 @@ msgPreview = msgPlain . preview . msgContentText
       | T.length t <= 120 = t
       | otherwise = T.take 120 t <> "..."
 
-viewRcvIntegrityError :: StyledString -> MsgErrorType -> CurrentTime -> CIMeta с 'MDRcv -> [StyledString]
+viewRcvIntegrityError :: StyledString -> MsgErrorType -> CurrentTime -> CIMeta c 'MDRcv -> [StyledString]
 viewRcvIntegrityError from msgErr ts meta = receivedWithTime_ ts from [] meta (viewMsgIntegrityError msgErr) False
 
+viewRcvDecryptionError :: StyledString -> MsgDecryptError -> Word32 -> CurrentTime -> CIMeta c 'MDRcv -> [StyledString]
+viewRcvDecryptionError from err n ts meta = receivedWithTime_ ts from [] meta [ttyError $ msgDecryptErrorText err n] False
+
 viewMsgIntegrityError :: MsgErrorType -> [StyledString]
-viewMsgIntegrityError err = msgError $ case err of
-  MsgSkipped fromId toId ->
-    "skipped message ID " <> show fromId
-      <> if fromId == toId then "" else ".." <> show toId
-  MsgBadId msgId -> "unexpected message ID " <> show msgId
-  MsgBadHash -> "incorrect message hash"
-  MsgDuplicate -> "duplicate message ID"
-  where
-    msgError :: String -> [StyledString]
-    msgError s = [ttyError s]
+viewMsgIntegrityError err = [ttyError $ msgIntegrityError err]
 
 viewInvalidConnReq :: [StyledString]
 viewInvalidConnReq =
diff --git a/stack.yaml b/stack.yaml
index 02d0edbc8..3c800500a 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -49,7 +49,7 @@ extra-deps:
   # - simplexmq-1.0.0@sha256:34b2004728ae396e3ae449cd090ba7410781e2b3cefc59259915f4ca5daa9ea8,8561
   # - ../simplexmq
   - github: simplex-chat/simplexmq
-    commit: 9f0b9a83d6dfbd926daf09883a81bf370544f48e
+    commit: 2b93e0b17d0556988885757e5b7305f6a1db65a7
   - github: kazu-yamamoto/http2
     commit: b5a1b7200cf5bc7044af34ba325284271f6dff25
   # - ../direct-sqlcipher
diff --git a/tests/ChatTests/Direct.hs b/tests/ChatTests/Direct.hs
index 92dc654cc..dac642d88 100644
--- a/tests/ChatTests/Direct.hs
+++ b/tests/ChatTests/Direct.hs
@@ -17,9 +17,11 @@ import qualified Data.ByteString.Lazy.Char8 as LB
 import Simplex.Chat.Call
 import Simplex.Chat.Controller (ChatConfig (..))
 import Simplex.Chat.Options (ChatOpts (..))
+import Simplex.Chat.Store (agentStoreFile, chatStoreFile)
 import Simplex.Chat.Types (authErrDisableCount, sameVerificationCode, verificationCode)
 import qualified Simplex.Messaging.Crypto as C
 import System.Directory (copyFile, doesDirectoryExist, doesFileExist)
+import System.FilePath ((</>))
 import Test.Hspec
 
 chatDirectTests :: SpecWith FilePath
@@ -79,6 +81,8 @@ chatDirectTests = do
       sameVerificationCode "123 456 789" "12345 6789" `shouldBe` True
     it "mark contact verified" testMarkContactVerified
     it "mark group member verified" testMarkGroupMemberVerified
+  describe "message errors" $ do
+    it "show message decryption error and update count" testMsgDecryptError
 
 testAddContact :: HasCallStack => SpecWith FilePath
 testAddContact = versionTestMatrix2 runTestAddContact
@@ -1763,3 +1767,49 @@ testMarkGroupMemberVerified =
       alice <## "member ID: 2"
       alice <## "receiving messages via: localhost"
       alice <## "sending messages via: localhost"
+
+testMsgDecryptError :: HasCallStack => FilePath -> IO ()
+testMsgDecryptError tmp =
+  withNewTestChat tmp "alice" aliceProfile $ \alice -> do
+    withNewTestChat tmp "bob" bobProfile $ \bob -> do
+      connectUsers alice bob
+      alice #> "@bob hi"
+      bob <# "alice> hi"
+      bob #> "@alice hey"
+      alice <# "bob> hey"
+    copyDb "bob" "bob_old"
+    withTestChat tmp "bob" $ \bob -> do
+      bob <## "1 contacts connected (use /cs for the list)"
+      alice #> "@bob hello"
+      bob <# "alice> hello"
+      bob #> "@alice hello too"
+      alice <# "bob> hello too"
+    withTestChat tmp "bob_old" $ \bob -> do
+      bob <## "1 contacts connected (use /cs for the list)"
+      alice #> "@bob 1"
+      bob <# "alice> decryption error, possibly due to the device change (header)"
+      alice #> "@bob 2"
+      alice #> "@bob 3"
+      (bob </)
+      bob ##> "/tail @alice 1"
+      bob <# "alice> decryption error, possibly due to the device change (header, 3 messages)"
+      bob #> "@alice 1"
+      alice <# "bob> decryption error, possibly due to the device change (header)"
+      bob #> "@alice 2"
+      bob #> "@alice 3"
+      (alice </)
+      alice ##> "/tail @bob 1"
+      alice <# "bob> decryption error, possibly due to the device change (header, 3 messages)"
+      alice #> "@bob 4"
+      bob <# "alice> decryption error, possibly due to the device change (header)"
+    withTestChat tmp "bob" $ \bob -> do
+      bob <## "1 contacts connected (use /cs for the list)"
+      alice #> "@bob hello again"
+      bob <# "alice> skipped message ID 5..8"
+      bob <# "alice> hello again"
+      bob #> "@alice received!"
+      alice <# "bob> received!"
+  where
+    copyDb from to = do
+      copyFile (chatStoreFile $ tmp </> from) (chatStoreFile $ tmp </> to)
+      copyFile (agentStoreFile $ tmp </> from) (agentStoreFile $ tmp </> to)
diff --git a/tests/ChatTests/Groups.hs b/tests/ChatTests/Groups.hs
index a6b180266..b80835992 100644
--- a/tests/ChatTests/Groups.hs
+++ b/tests/ChatTests/Groups.hs
@@ -9,7 +9,10 @@ import Control.Concurrent (threadDelay)
 import Control.Concurrent.Async (concurrently_)
 import Control.Monad (when)
 import qualified Data.Text as T
+import Simplex.Chat.Store (agentStoreFile, chatStoreFile)
 import Simplex.Chat.Types (GroupMemberRole (..))
+import System.Directory (copyFile)
+import System.FilePath ((</>))
 import Test.Hspec
 
 chatGroupTests :: SpecWith FilePath
@@ -48,6 +51,8 @@ chatGroupTests = do
     it "leaving groups with unused host contacts deletes incognito profiles" testGroupLinkIncognitoUnusedHostContactsDeleted
     it "group link member role" testGroupLinkMemberRole
     it "leaving and deleting the group joined via link should NOT delete previously existing direct contacts" testGroupLinkLeaveDelete
+  describe "group message errors" $ do
+    it "show message decryption error and update count" testGroupMsgDecryptError
 
 testGroup :: HasCallStack => SpecWith FilePath
 testGroup = versionTestMatrix3 runTestGroup
@@ -1986,3 +1991,76 @@ testGroupLinkLeaveDelete =
       bob ##> "/contacts"
       bob <## "alice (Alice)"
       bob <## "cath (Catherine)"
+
+testGroupMsgDecryptError :: HasCallStack => FilePath -> IO ()
+testGroupMsgDecryptError tmp =
+  withNewTestChat tmp "alice" aliceProfile $ \alice -> do
+    withNewTestChat tmp "cath" cathProfile $ \cath -> do
+      withNewTestChat tmp "bob" bobProfile $ \bob -> do
+        createGroup3 "team" alice bob cath
+        alice #> "#team hi"
+        [bob, cath] *<# "#team alice> hi"
+        bob #> "#team hey"
+        [alice, cath] *<# "#team bob> hey"
+      copyDb "bob" "bob_old"
+      withTestChat tmp "bob" $ \bob -> do
+        bob <## "2 contacts connected (use /cs for the list)"
+        bob <## "#team: connected to server(s)"
+        alice #> "#team hello"
+        [bob, cath] *<# "#team alice> hello"
+        bob #> "#team hello too"
+        [alice, cath] *<# "#team bob> hello too"
+      withTestChat tmp "bob_old" $ \bob -> do
+        bob <## "2 contacts connected (use /cs for the list)"
+        bob <## "#team: connected to server(s)"
+        alice #> "#team 1"
+        bob <# "#team alice> decryption error, possibly due to the device change (header)"
+        cath <# "#team alice> 1"
+        alice #> "#team 2"
+        cath <# "#team alice> 2"
+        alice #> "#team 3"
+        cath <# "#team alice> 3"
+        (bob </)
+        bob ##> "/tail #team 1"
+        bob <# "#team alice> decryption error, possibly due to the device change (header, 3 messages)"
+        bob #> "#team 1"
+        alice <# "#team bob> decryption error, possibly due to the device change (header)"
+        -- cath <# "#team bob> 1"
+        bob #> "#team 2"
+        cath <# "#team bob> incorrect message hash"
+        cath <# "#team bob> 2"
+        bob #> "#team 3"
+        cath <# "#team bob> 3"
+        (alice </)
+        alice ##> "/tail #team 1"
+        alice <# "#team bob> decryption error, possibly due to the device change (header, 3 messages)"
+        alice #> "#team 4"
+        (bob </)
+        cath <# "#team alice> 4"
+        bob ##> "/tail #team 4"
+        bob
+          <##? [ "#team alice> decryption error, possibly due to the device change (header, 4 messages)",
+                 "#team 1",
+                 "#team 2",
+                 "#team 3"
+               ]
+      withTestChat tmp "bob" $ \bob -> do
+        bob <## "2 contacts connected (use /cs for the list)"
+        bob <## "#team: connected to server(s)"
+        alice #> "#team hello again"
+        bob <# "#team alice> skipped message ID 8..11"
+        [bob, cath] *<# "#team alice> hello again"
+        bob #> "#team received!"
+        alice <# "#team bob> received!"
+        bob #> "#team 4"
+        alice <# "#team bob> 4"
+        bob #> "#team 5"
+        cath <# "#team bob> decryption error, possibly due to the device change (earlier message, 2 messages)"
+        cath <# "#team bob> incorrect message hash"
+        [alice, cath] *<# "#team bob> 5"
+        bob #> "#team 6"
+        [alice, cath] *<# "#team bob> 6"
+  where
+    copyDb from to = do
+      copyFile (chatStoreFile $ tmp </> from) (chatStoreFile $ tmp </> to)
+      copyFile (agentStoreFile $ tmp </> from) (agentStoreFile $ tmp </> to)
diff --git a/tests/ChatTests/Utils.hs b/tests/ChatTests/Utils.hs
index 31b1a8c00..ff112d854 100644
--- a/tests/ChatTests/Utils.hs
+++ b/tests/ChatTests/Utils.hs
@@ -272,6 +272,9 @@ getInAnyOrder f cc ls = do
 (<#) :: HasCallStack => TestCC -> String -> Expectation
 cc <# line = (dropTime <$> getTermLine cc) `shouldReturn` line
 
+(*<#) :: HasCallStack => [TestCC] -> String -> Expectation
+ccs *<# line = concurrentlyN_ $ map (<# line) ccs
+
 (?<#) :: HasCallStack => TestCC -> String -> Expectation
 cc ?<# line = (dropTime <$> getTermLine cc) `shouldReturn` "i " <> line