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Swapping in a used TCU will probably get you a SOS error but probably are already getting one. You can code out BMW Assist to get rid of it. Bluetooth will still work.
You can remove the TCU from the MOST fiber loop to get the radio working again. See attached PDF. You can use a flashlight to locate the TCU most fiber and remove them from the loop. That will put all the good components back on the loop and allow them to function.
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