diff --git a/docs/MO_DG/prepare_model/Model_Optimizer_FAQ.md b/docs/MO_DG/prepare_model/Model_Optimizer_FAQ.md
index f9aef04a0a9..bb599cf93b5 100644
--- a/docs/MO_DG/prepare_model/Model_Optimizer_FAQ.md
+++ b/docs/MO_DG/prepare_model/Model_Optimizer_FAQ.md
@@ -627,4 +627,16 @@ It means that you trying to convert the topology which contains '_contrib_box_nm
   });
 </script>
 
-\endhtmlonly
\ No newline at end of file
+\endhtmlonly
+
+#### 103. What does the message "ModelOptimizer is not able to parse *.caffemodel" mean? <a name="question-103"></a>
+
+If a '*.caffemodel' file exists and it is correct, the error possibly occured due to the use of Python protobuf implementation. In some cases, it shows error message during model parsing, for example: "'utf-8' codec can't decode byte 0xe0 in position 4: invalid continuation byte in field: mo_caffe.SpatialTransformerParameter.transform_type". You can either use Python 3.6/3.7 or build 'cpp' implementation of protobuf yourself for your version of Python. For the complete instructions about building `protobuf` from sources, see the appropriate section in [Converting a Model to Intermediate Representation](Config_Model_Optimizer.md).
+
+#### 104. What does the message "SyntaxError: 'yield' inside list comprehension" during MxNet\* model conversion mean? <a name="question-104"></a>
+
+The issue "SyntaxError: 'yield' inside list comprehension" might occur during converting MXNet\* models (mobilefacedet-v1-mxnet, brain-tumor-segmentation-0001) on Windows* platform with Python* 3.8 environment. This issue is caused by API changes for `yield expression` in Python 3.8.
+The following workarounds are suggested to resolve this issue:
+1. Use Python 3.6/3.7 to convert MXNet\* models on Windows
+2. Update MXNet: pip install mxnet=1.7.0.post2
+Note that you might have conflicts between previously installed PyPI dependencies.
\ No newline at end of file
diff --git a/model-optimizer/mo/front/caffe/loader.py b/model-optimizer/mo/front/caffe/loader.py
index 2ffca364fb6..14497c6108d 100644
--- a/model-optimizer/mo/front/caffe/loader.py
+++ b/model-optimizer/mo/front/caffe/loader.py
@@ -130,10 +130,16 @@ def load_caffe_proto_model(caffe_pb2, proto_path: str, model_path: [str, None] =
                 map = mmap.mmap(infile.fileno(), 0, access=mmap.ACCESS_READ)
                 model.MergeFromString(map)
     except Exception as e:
+        third_point = ''
+        if api_implementation._implementation_type == 'python':
+            third_point = '      3. Python protobuf implementation was used. Some models can\'t be converted ' + \
+                          ' in this configuration. Please, use Python version with existing cpp implementation of ' + \
+                          'protobuf library or build it by yourself\n' + refer_to_faq_msg(103)
         log.error('Exception message: {}\n\n'.format(e) +
                   '    Possible reasons:\n' +
                   '      1. {} does not exist\n'.format(model_path) +
-                  '      2. {} does not have a valid structure\n'.format(model_path), extra={'framework_error': True})
+                  '      2. {} does not have a valid structure\n'.format(model_path) + third_point,
+                  extra={'framework_error': True})
         raise FrameworkError('Model Optimizer is not able to parse {}'.format(model_path)) from e
 
     return proto, model