You only have Radio and CD slot? My '01 has a cassette not a CD. I have the 6 CD player unit in the trunk.
I wonder if somebody upgraded the unit by pulling the cassette player and putting in a CD player and that is your problem.

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