adb devices You should see your device serial number with “device” next to it.
Disclaimer: This process will wipe all data, void the warranty, and may brick the device if done incorrectly. Proceed at your own risk. Your Nokia 3.4 has served you well—stock Android, clean interface, monthly security patches. But lately, you’ve felt the itch for more: custom ROMs, root access, kernel tweaks, or just removing bloatware that even Nokia couldn’t hide. Unlock Bootloader Nokia 3.4
On your PC, open a command prompt in the platform-tools folder and type: adb devices You should see your device serial
Run it (right-click → Run as administrator). Your Nokia 3
Navigate to the extracted unlock tool folder. Inside, you’ll find a script named unlock_nokia.bat (or similar).
Use volume keys to highlight “UNLOCK THE BOOTLOADER” and press power button to confirm.
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.