although you may have navigation, or not, there may be other reasons the update fails. First of all make sure your APIM is equipped for navigation. Run the APIM Interrogator Utility here and see if the APIM is indeed equipped with 32GB of storage.
Tutorial: APIM Interrogator Utility - Ford / Guides & Info - CyanLabs Official Community
This will also confirm your Sync version in the xml file. Just open it with IE.