(or MIUI version for Xiaomi) 7 times until you see "You are now a developer". Toggle OEM Unlocking Settings > System > Developer Options USB Debugging OEM Unlocking Enter Fastboot Mode Turn your phone off. Volume Down
You will usually see a prompt on the device screen warning that this will wipe all user data . Use the volume keys to select "Yes" and the power button to confirm. Common Pitfalls flashing lock flag is locked please unlock it first full
If the device allowed you to simply change the Lock Flag via a software command while it was locked, the security would be useless. A hacker could just send an "Unlock" command. (or MIUI version for Xiaomi) 7 times until