Verify fastboot connection:

Run it (right-click → Run as administrator).

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 .

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.

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

For now, you hold an unlocked device in your hands, and the possibilities are endless.

Use volume keys to highlight “UNLOCK THE BOOTLOADER” and press power button to confirm.

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

The phone reboots, erases everything, and starts fresh — like a newborn. After setup, you notice the boot screen now shows an orange state warning for 5 seconds before booting. That’s the mark of an unlocked bootloader.

Now reboot to bootloader:

To verify: Reboot to bootloader again and type:

adb devices You should see your device serial number with “device” next to it.