Never attempt a firmware upgrade over Wi-Fi. If the wireless connection drops mid-process, the router will become permanently broken ("bricked").

You can upgrade the Fiberhome SR120-A firmware through its web-based management interface. This router is typically provided by Internet Service Providers (ISPs), meaning they often push updates automatically over the network. Firmware Update Steps

: Open a web browser and enter the default IP address 192.168.51.1 .

: 1 GE WAN port and 4 GE LAN ports for full gigabit connectivity.

The FiberHome SR120-A is a small home/SMB router/ONU often shipped by ISPs. “Firmware” refers to the device’s internal software that controls networking, security, and device features. Firmware updates can add features, fix bugs, and patch security vulnerabilities.