This is an improvement over the quirky behavior I experienced when trying to upgrade the RT-AC66U's software." Quirky? This page How to update the firmware on an ASUS networking product says "After updating the firmware, we recommend that you restore the factory default settings by pressing the reset button of the device for 5 seconds." This is horrible, it means that you lose all the customizations you made to the router. There are a number of ways that the owner of a router can learn about the availability of new firmware.I have seen two different approaches for manually updating router firmware.
The router will then copy the new firmware into its memory andperform the update, after which it will reboot.
Use a computer that connects to the routerusing an Ethernet cable.
You may cause the router to becomeinoperable due to the wireless connection dropping while theupgrade is in process. Once this is done, log in to the web configuration interface, goto the TOOLS or MAINTENANCE tab and click on the UPDATE FIRMWARE button on theleft-hand side.
This includes the login passwords, the IP address and Internet connection settings provided by your ISP.
Please ensureyou have backed this information up before proceeding.
Updating the firmware on a router is a major pain the neck.