I have a Mi 10 on MIUI 12 and my volume issue is slightly different. When I connect a bluetooth device the volume on the phone goes to max no matter what the slider is set to.
I tried to revert back to the previous build, but could not without a full wipe so i just reinstalled this one again. Not really feeling like doing a full data wipe right now
I am having an installation issue. I unlocked my bootloader, installed the twrp linked in the rom thread. I then wipe the phone data and install the stable miui 11, but when i reboot it keeps going back to twrp and will not boot to the system