To verify: Reboot to bootloader again and type:

But one day, a critical security patch arrives. You can’t install it normally. You have to re-lock the bootloader — which requires flashing stock firmware first. That’s another story.

adb reboot bootloader The phone screen goes black, then shows the screen — a tiny white text on a black background.

Navigate to the extracted unlock tool folder. Inside, you’ll find a script named unlock_nokia.bat (or similar).

The gatekeeper to this freedom is the . Nokia (HMD Global), unlike Google Pixels or OnePlus devices, does not officially provide an unlock method for most of its phones. The Nokia 3.4 is no exception. But the modding community found a backdoor — an unofficial exploit via a tool called Nokia Bootloader Unlock .

Now reboot to bootloader:

Verify fastboot connection:

fastboot oem device-info Output should show: (bootloader) Device unlocked: true