If you see this during a BIOS update or when using disk tools (like Samsung Magician), the drive is in a Frozen State The Cause:
For end users, the best defense is completing all inventory transactions fully. For administrators, regular lock monitoring and process cleanup are essential. And when the message says "unlock it first full," they mean exactly that—do not settle for a partial fix; perform a complete, system-level release of the lock. flashing lock flag is locked please unlock it first full
He looked at the red light on the door. Blink. Blink-blink. Blink. If you see this during a BIOS update
Android devices ship with a locked bootloader to ensure that only software digitally signed by the manufacturer can run. The "Flashing Lock Flag" is a software switch within the bootloader that determines if you are allowed to write data to system partitions. If this flag is active (locked), any command to flash an image will be rejected by the device to prevent "bricking" or malicious software installations. Android Open Source Project How to Unlock the Flashing Flag He looked at the red light on the door