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Since I had lots of issues with my Bluetooth connection to my car-radio since I upgraded my Mi4C to Android 7.0, I can tell you how I solved it: I downgraded to 5.1.1 again (luckily I could just install 6.12.22, do a factory reset and everything was working). Apparently Andoird 7.0 has issues...

On Mi4C I have issues with bluetooth since switching from Android 5.11 to 7.0. My car radio (KDC-BT35U) loses connection after a couple of seconds. I've had that with all the android 7-Versions I tried, also tried an factory reset, but that also didn't. Any ideas?

@Mi4c-Owners: Can anyone without an official unlock tell me whether the update actually works without issues?

Is there a way to unlock the bootloader without losing data?

Hi, on my Mi4C I installed the 7.2.9 ROM, apparently it's the version with the drain issue. Now I tried installing the reuploaded version, but it turns out my phone hangs on the Mi-Logo whenever I try to install a ROM now. I tried the ruploaded one, I tried 6.12.22, but no dice. Any ideas?