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I ended up replacing the Harman/Becker 86100-YY050 EXT_BOX. Found one cheap enough since I mainly wanted my bluetooth back. It is back to being...
Firmware links since I couldn't find them anywhere, my logic was I would be able to put an older version on, and it might fix it but it rejects...
After some further testing it looks like it failed to update the EXT_BOX the Harman/Becker86100-YY050. I am guessing its dead since it wont accept...
I attempted to update the head unit/no navigation as it was on 2.x to 5.5? using 01039-HBEKR-16A. I was attempting to see if an update would fix...
I signed up to clarify this for others since I know the post is old. Sorry if there is a more formal guide on this already but my searches came up...
