I have a Tenda N80 router that I've been trying to upgrade to Tomato for awhile now. The Tenda factory firmware rejects the Tomato firmware upload with a nondescript page that simply says "Error!" Over on another thread, I was advised to use a TTL-serial connection to stop the router from booting so I could access the CFE webserver. I succeeded in accomplishing this, and if it helps,...
Tenda N80 - Tomato firmware support
Tenda N80 - Tomato firmware support