Someone at my home stepped on my Fonera and broke its antenna few months back. Since then it was sitting in the closet with all the other hardware that I had.
Finally, i decided to flash it with DD-WRT to try out if it works well. My Fonera was having 7.1R3 firmware. Just by changing the DSN to one provided for Kolofonium helped to enable SSH on the router. Once I got SSH enabled, the confusion was about logging onto it. The admin user of Fonera is actually a root user when used with SSH.
Finally logged in. Loaded patched kernel, changed the loader and then finally loaded DD-WRT. Keep watching for more updates.