A user can update the firmware of a Linksys router with the help of the myrouter.local interface. If you want to update the firmware without interacting with the web interface of the Linksys router, you can do so by the Linksys app. Make sure that you have turned on the Automatic Firmware update which will notify you with the latest firmware update. All you have to do is tap yes and when a notification appears on the screen of updating the firmware.