Troubleshooting:
Lock and unlock the bootloader | Android Open Source Project
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On some older Nokia models (like Nokia 3.4), the combo is Volume Up + Power or both Volume buttons + Power . If Volume Down doesn’t work, try Volume Up.
If you run into problems, here are some common solutions: Troubleshooting: Lock and unlock the bootloader | Android
If you want, I can:
Open a Command Prompt, PowerShell, or Terminal window inside your platform-tools folder. Verify the connection by typing: adb devices Use code with caution. Can’t copy the link right now
The terminal should return your device serial number and the word fastboot .
Modifying bootloader or attempting unlock may void warranty, brick your device, or cause data loss. This report is for educational purposes only. Proceed at your own risk.
Do not attempt to flash or unlock unless you have the correct firmware backup. Always confirm your exact model by going to Settings → About phone → Model number .