I had the "Radio Will Not Switch Off" problem. I cured it by removing the complete dash unit, unplugging and replugging the multi-pin plug on back. That was 2 years ago and it worked fine since. It costs nothing to try.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i