For example, I will update the firmware in the ASUS RT-N53 router with the installed version 126.96.36.199.70.
I will describe the steps in steps:
1) Download the new firmware from the official site:
2) Open the router settings by typing the address http://192.168.0.1 in the browser (maybe 192.168.1.1) and enter the standard login – admin, the password – admin
3) In the interface that opens, at the bottom left, open the “Advanced
Settings” – “Administration”, select the “Firmware Update” tab, click “Browse” in the window that opens and select the firmware previously downloaded and unpacked from the archive, click “Send” to start the update process. We are waiting for the process to complete about 2-5 minutes.