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When connected via USB you have no control of the volume other than the cars built in volume knob. It is normal, I’ve had this since the day I got my car and talked to 2 different BMW dealers/service partners and also contacted BMW themselves via email in Germany. They all said it is normal and there is nothing we can do as customers to fix this except try using AUX, however since my phone is a iPhone 7 Plus and I like my phone connected to the vehicle for both charging and connecteddrive purposes I’ve switched back to USB. Yes it does help as it gives you additional control of the volume, however I deemed it not important enough to completely change it. I’ve even got the car updated to the latest I-level for this with no result. Just keep it using like you always do, raise or lower the volume when switching between the sources.
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