Because this device is a managed Fixed Wireless Access (FWA) router, Nokia does not host public, downloadable firmware files for manual installation. Instead, firmware updates are exclusively controlled and pushed remotely by your internet service provider (ISP).
A stable connection is better than a bricked gateway. Do not attempt manual flashing.
Before updating the firmware, ensure that the device is properly configured and that you have a backup of your settings. Firmware updates can sometimes reset the device to its default settings.
Let me be blunt: I have seen dozens of users brick their FastMile gateways searching for manual firmware. Here is what happens when you download from a site like nokia-firmware-download(dot)com :
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