Huawei discontinued official bootloader unlocking, but for legacy devices:

The error message is a security safety block triggered by the Android Fastboot framework . It prevents the modification of core device partitions when the bootloader is locked.

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: The device security flag is preventing any modification to the system partitions. This is a safety feature to prevent unauthorized software (like malware or unverified firmware) from being installed.

You can't unlock the bootloader through commands alone; you must first allow it in your phone's software. About Phone Build Number 7 times until it says "You are now a developer!". Go back to Developer Options OEM Unlocking USB Debugging

Manufacturers sometimes lock the flashing flag tighter in newer updates. Flash an older stock ROM (if allowed) first, then unlock.

A very common pitfall in Android is confusing the two bootloader interfaces. Many newer Android devices boot into a "" or " fastbootd " mode by default. This is a limited implementation that exists while the main Android OS is running. It is designed for flashing dynamic partitions and lacks the full access needed to unlock the bootloader.

Yes, but be absolutely sure you are running 100% stock, signed images. Locking with custom images can brick the device.

After the device reboots back into Fastboot mode, check the status to ensure the "flag" is no longer locked: fastboot flashing get_unlock_ability (Should return fastboot getvar unlocked (Should return Fairphone Community Forum Troubleshooting "Remote 39" Failures If the command still fails with error code 39:

Go back to the main Settings menu, select , and open Developer Options . Locate OEM Unlocking and toggle it to ON . Locate USB Debugging and toggle it to ON .

Open your terminal or command prompt inside your Google Platform Tools directory. Force the device to reboot into bootloader mode by typing: adb reboot bootloader Use code with caution.

: Standard commands often fail; you may need a specialized tool like the TomKing62 CVE Unlocker .

Only if you have signed firmware from the manufacturer or use an EDL (Emergency Download Mode) box with authorized credentials. For most users, no.

You cannot unlock the bootloader through a computer alone; you must first give the phone permission from within the Android OS. Open > About Phone .

To avoid re-encountering the error, do not run:

On Android devices:

Use dd or mtkclient to back up: