Ive got eu stable on MI Max 3.
TWRP - Wipe:
/Dalvik and /Data.
Install 8.11.29.
Wipe /Dalvik and /Data
Not installed anything else - reboot to system.
Configure first start google account and update all apps.
Reboot again to system. Still a lot of lags.
It's horrible.
Can I switch back to stable...