Plug in the cable (USB and 3.5mm aux jack) first to the AUX on your BMW when the car is off, then start your car then. switch to AUX, then plug in
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GENUINE BMW USB Type A to C Adapter - 61122470922 £25.94 - PicClick UK
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BMW & Mini Cooper USB+AUX ports – Airdual Bluetooth Adapter - Airdual
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Universelles Bluetooth-Audiokabel für das Auto USB / 3,5 mm AUX Music Interface Adapter Kompatibel mit BMW Serie 1, 2, 3, 5, 6, 7, X1 X3 X4 X5 X5 X6 E46 und
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Bluetooth Adapter for BMW Mini Cooper USB+AUX iPod iPhone Music Interface - AliExpress