If you’re seeing the error message you are likely dealing with an Android device (often a Xiaomi, Redmi, or Poco) that has a locked bootloader .

(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

Surprisingly, the phrase "flashing lock flag is locked – please unlock it first full" also appears in diagnostic logs for high-security electronic padlocks and smart cabinet locks (e.g., ZKTeco, Sargent, or LockState devices). In this context:

Look at your display panel for a small key or lock icon bridging two buttons. Press and hold those two buttons simultaneously for .

This error is most frequent in the following modules and transactions:

If the lock belongs to your own user session: