No. Nokia Fastmile gateways block downgrades via secure boot. Attempting to flash an older version will result in “Image verification failed.”
Most units, especially those from T-Mobile , update automatically between 1:00 AM and 3:00 AM PST . Ensure your gateway is powered on during these hours. Manual Check via Web Interface: Connect a device to your gateway's Wi-Fi. Nokia Fastmile 5g Gateway Firmware Update LINK
Therefore, the method for finding the update link depends entirely on whether you have an or a Carrier-Branded Unit . especially those from T-Mobile
For specific ISP versions, check the T-Mobile Support Page or Rogers Support . Nokia 5G21 Gateway | T-Mobile 5G Home Internet Nokia Fastmile 5g Gateway Firmware Update LINK
at http://192.168.12.1 .
This is the #1 point of confusion. – your carrier does.