Log into the router's web interface, which is similar to when you first set it up, then navigate to the section where you can update the firmware. This is normally in the Administration, System, Setup ...
If you own a Netgear router it may well be time to check for updates, as the company has released a security advisory to update the firmware as soon as possible on several models. While details ...
Wi-Fi access points that should get a firmware update are the Wi-Fi 6 WAX206, WAX220, and WAX214v2. Netgear published an advisory for each vulnerability on February 1st.
The white blinking light could occur if you haven't activated your Xfinity router device. Before proceeding to the steps ...