Firstly remember that if you upgrade from a ROM prior to 7.2.9 you must first remove the lock. This says that you have the bootloader open, connect the phone in fastboot mode and writes to the pc, fastboot oem device-info, if it comes true, it is open, with what follows a tutorial that I leave you to install twrp by adb , If you get false, you have to open the bootloader with permission of Xiaomi. Once done this you can upgrade from twrp to the last rom.
It is for mi 4s
Enviado desde mi MI 4S mediante Tapatalk
