Wireless N 300m Firmware Update

Whenever possible, connect your computer to the router using an Ethernet cable . Updating over Wi-Fi is risky; if the signal drops during the process, it can corrupt the firmware.

Once you have the Brand and Model, go to the manufacturer's official support page: wireless n 300m firmware update

The Ultimate Guide to Wireless N 300M Firmware Updates: Boost Performance and Security Whenever possible, connect your computer to the router