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Hey all, I wanted to respond because my resolution was different then any I have found for this same issue. My problem was a result of my poor coding.... It would seem that when I tried to update the CAFD file in the AMP ECU, I must have jacked something up when coding. At roughly the same time I was installing an Android CID upgrade. I just assumed I jacked up the fiber cable or fried my amp.....
Anyways, playing around today with BimmerUtility and e-Sys, I tried the update and code in eSys and also used BU to remove and then add the HiFi VO back and voila, sound is back.
Short answer - always check your code
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