: Modifying configuration files or flashing unofficial firmware can "brick" your device, making it unusable, or cause "Authentication Failure" errors with your ISP. your specific configuration file? How do I login to my Nokia router? - Airband

Connect your computer directly to the Nokia router using an Ethernet cable (do not use Wi-Fi for this process).

This method is the most common and widely documented way to unlock the router. It involves :

Log in with the elevated credentials exposed or defined during the XML file editing phase to achieve a root Linux filesystem prompt. Important Safety Warning & Troubleshooting

Save and upload the modified configuration file back to the router.