I can see that advice has been offered to download fastboot ROM and flash with Miflash with a relock flag.
I have tried to get the phone recognised in fastboot with adb and fastboot downloaded drivers, but this has not worked.
I have reset the phone removing the Miui account.
Does this work if I have never altered the ROM by installing TWRP? I unlocked the bootloader than never needed to change the ROM as I have been happy with the experience. Now I want to remove the "Unlocked device" at boot.
I have tried to get the phone recognised in fastboot with adb and fastboot downloaded drivers, but this has not worked.
I have reset the phone removing the Miui account.
Does this work if I have never altered the ROM by installing TWRP? I unlocked the bootloader than never needed to change the ROM as I have been happy with the experience. Now I want to remove the "Unlocked device" at boot.