Help me. Mi4c. Updated with xiaomi.eu 6.12.22 on 7.2.9. I would like to to revert back because of bugs (a type of HDR does not work, voice messages are not recorded, two cores do not work). What should be done? Unlocked bootloader, install twrp-3.0.2-0-lithium and 6.12.22 or is not that simple...