After coding an ECU, you must force a complete reboot. Turning the car off and on is not enough.
If you want a permanently fixed, error-free G30, follow this professional workflow. This is what dealerships and top BMW coders use. bmw coding g30 fixed
Your iDrive screen takes 30+ seconds to boot, or shows a black screen with sound only. The Cause: Corrupted head unit cache or a failed OTA (over-the-air) update. The Fix: Perform a Head Unit reboot (not just a restart). After coding an ECU, you must force a complete reboot
If your goal is to get a “fixed” coding result, avoid these mistakes: After coding an ECU