This is my first attempt to install an OpenWRT firmware on a Asus RT-N66U B1 wireless router. I followed instructions on the Factory install: First-time installation on a device. I selected the file and proceeded with uploading but received a Invalid Firmware Upload message.
I was unable to find a troubleshoot guide on this particular issue. Any help would be much appreciated.
Oh, thanks @slh. I am glad I didn't try to flash my RT-N66U then!
@kiekar: If you want to flash then you could have a look at AsusWRT-Merlin, DD-WRT. You may need to do some research to see how secure they are, or if hey are based on a recent kenrel and free form known vulnerabilities.
There are also some Tomato variants of firmware, such as AdvancedTomato--which has good looking interface really but it was last updated in May 2017, so will be vulnerable. There is also FreshTomato, which is currency an active project and recently released a beta, but I don't see a download there for RT-N66U. You could probably check with them.
Tried to install openwrt and advanced tomato using the asus restoration utility with no success. Each time I tried I received a message "The wireless router is not in rescue mode" even when the router was indicating it was by a slow flashing blue light. I even tried clearing the nvram but still no success. Any other thoughts.