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Indeed an update done through the IDrive system (such as the OTA one pushed by BMW) does not mean only the Idrive / Headunit stuff get updated. Rather ANY ECUs of the car will/can be updated and that is exactly the reason why a flashtune is lost as the DME gets updated too in the process. Coding gets also lost in the process as the various ECUs (BDC, DKOMBI4, IHKA, KAFAS4 etc. etc..) get updated with the latest software and ultimately at the end of it car is on the latest IStep level. Coding needs to be redone and the ECU flashtune RE-injected by your trusted tuner. Thus it is not just a "multimedia-stuff" upgrade or enhancement (Android Auto, Apple Car Play features and so on), but rather a complete update of potentially ALL ECUs if applicable.
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