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Software Update
The dealer recently updated my 2014 5 series with M performance package with the OS update. He said the OS update would allow the other software to be updated without an issue.
Took the car home and plugged in the USB in the center console, and the update started right away.
Prior to the OS update, I was getting "incompatible software" warning. I used a standard USB formatted to FAT 32.
Check your car at the dealership for the overall operating system, it may be the issue for the DIY update problem.
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