So, over 25 days at the dealer later the car got repaired. The radio replacement (did twice) and reprogramming did not work. Finally, BMW AG had to make a special program to recode the car properly which solved the issue. They said it was the only such mistake they had... I am happy that I insisted on doing this, a bit disappointed that this took them so long but all in all there is a happy ending to this story. Thanks Calamari for your help!
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