Tap 7 times until you see "You are now a developer". Go back to System > Developer Options . Find OEM Unlocking and toggle it ON .
fastboot getvar unlocked
Once in bootloader mode, use one of the following commands depending on your device: fastboot flashing unlock (Standard for newer devices). fastboot oem unlock (Common for older devices). Confirm on Device Tap 7 times until you see "You are now a developer"
This error occurs when you attempt to flash a custom partition (like a recovery image) onto an Android device using the Fastboot command, but the process is blocked by a security feature within the device's bootloader [3†L16-L17][6†L10-L12]. The "Flashing Lock Flag" acts as a gatekeeper. It's a fundamental security mechanism designed to prevent unauthorized modifications to the device's software, ensuring system integrity and security.
Before you can run the unlock command, your phone's OS must permit it. fastboot getvar unlocked Once in bootloader mode, use
Prevention is always better than cure.
Connect the phone to a computer with Android platform tools installed, open a terminal window, and run the following command sequence: The "Flashing Lock Flag" acts as a gatekeeper
: The fundamental toggle in Android's developer configuration is turned off.
fastboot oem unlock-go fastboot flashing unlock_critical