Once you get a fresh install on the Fonera, Jasager should be installed. Try hitting it at http://192.168.1.1:1471
I’ll have more later with my results of playing tricks locally.
I wanted to update this post and put more references to some other great resources to read.
Hak 5 forums have many people playing with the Jasager project. I suggest you read as many post before you attempt this hack.
HIR is a new website that i found with some good documentation on the Jasager installation if you are wanting to go a different route to flash.