Just starting this topic in event anyone else runs into this issue. Basically I was discussing with Support on Skype.
Problem: MSV80 DME with CAS3 from 128i E82 has the following errors:
2f4c DME: EWS-DME message incorrect
2f4a DME: Interface EWS (IMMO)-DME
What we did was clone over this DME to another used DME with KTAG, then verified these errors are no longer present in ISTA. However when attempting to start vehicle it cranks and errors return. We then proceeded to write the ISN to CAS3 (firmware downgraded needed), and still same issue.
So next steps to try is another CAS3 unit. But did not want to clone the CAS3 if possible corrupted data already on original. So will backup FA and write over to donor CAS3 then write the old ISN to donor and then try to do DME-CAS ABL via ISTA and see what happens. Interesting in ISTA this error does not show up, but in AutoHex it does, and when it does vehicle never starts. So I am assuming if I get this done correctly and no errors in AutoHex vehicle should turn over.
Will post updates after CAS3 replacement.