Hello.
As the template you filled asks, please upload you log.
Also, create a USB interrogator log and upload the log as well (make sure to edit the file name and also the content of the file to remove your VIN).
From what you are saying and since it’s a non-nav unit, this seems to be a case of the unit lacking enough space to get the update done. If this is the issue, this could be solved by removing gracenotes to free up some space.
This has been covered in the past, check Tutorial: Sync 3.4 NON-NAV APIM: Failure to Update to Newer Version Sync 3.4 for reference. Syn3updater can now create a package to remove gracenotes.