Firmware for the (a GPON Optical Network Terminal or ONT) is typically not available for public download directly from Nokia’s website, as these devices are managed and updated remotely by your Internet Service Provider (ISP) via the TR-069 protocol.
The firmware is customized for each ISP (different VLANs, VoIP settings, TR-069 remote management). Installing a generic or another ISP’s firmware will cause: Nokia G-120w-f Firmware Download
Log in (Default credentials are often admin/admin or user/user ). Firmware for the (a GPON Optical Network Terminal