Most users do not need to manually download or search for firmware files.
Leave it connected to power and 5G for 24 hours. It will retry automatically. If still failing, call your ISP. nokia fastmile 5g gateway 3.1 firmware download
Most users do not need to download a file. The gateway typically checks for updates at 2:00 AM local time. Most users do not need to manually download
In 99% of cases, you cannot manually upload a .bin file. The web interface (http://192.168.12.1) does not have a "Firmware Upgrade" section like traditional routers. If still failing, call your ISP
The gateway periodically checks the carrier’s update server. When a new firmware version is available, it downloads it in the background (usually between 2 AM and 4 AM local time). The gateway then reboots to apply the update.
In short: Unlike a computer, you cannot uninstall an update. The Nokia FastMile 3.1 does not have a rollback mechanism for consumer use.