FIRST OF ALL BACK UP FILES, PHOTOS, CONTACTS ETC
REMOVE ANY PASSWORD, LOCKSCREEN FINGERPRINT ETC, PHONE FREE TO USE WITHOUT ANYTHING SO YOU SHOULD BE FINE ON TWRP
battery more than 50%, ideal would be between 70 and 90%
INSTALL TWRP for MI 9T/K20, download here: turn off...
few bugs on redmi note 4x 7.9.17:
editing gallery sometimes FC
i turn on developer options and usb debugging, doesnt stay, if i reboot i have to do it again
battery stats turn to 0 after a reboot or turn off the phone..so if i have 3 hours of screen and reboot, turns to...