Connect the phone to a computer with Android platform tools installed, open a terminal window, and run the following command sequence:
By following the manufacturer-specific unlocking instructions in this guide, you can safely disable the lock flag, flash your desired images, and regain full control over your hardware. Always remember to back up your data, respect the security mechanisms, and proceed with caution—unlocking the bootloader is a powerful step that opens the door to custom firmware, but also to potential risks if done carelessly.
fastboot flash vbmeta vbmeta_null.img --disable-verity --disable-verification Connect the phone to a computer with Android
The error will manifest in your command-line or terminal interface after issuing a fastboot flash command. It will appear in a similar format to: FAILED (remote: 'Flashing Lock Flag is locked. Please unlock it first!') [5†L13-L14][7†L20-L21]. While the text is a clear indicator, you might also see other variations referencing lock states, such as flashing is not allowed in lock state [8†L8-L9].
Once the device reboots (and wipes), you must enable and OEM Unlocking again in Developer Options to ensure the lock stays off. It will appear in a similar format to:
Go to > System/Additional Settings > Developer Options . Toggle OEM Unlocking and USB Debugging to On . 2. Execute the Unlock Command
The solution involves correctly guiding your device to a state where it accepts the unlocking command. Follow these steps in order, as they progress from quick checks to more advanced fixes. Once the device reboots (and wipes), you must
This is the standard command according to the Android Open Source Project . Command B (Legacy Standard) fastboot oem unlock Use code with caution.