Problem with Belkin F5D6230-3 Firmware

I just upgraded the firmware on my Belkin F5D6230-3 Wireless Router
and the router no longer works. Is it possible to revert back to the
old firmware somehow. I updated it by accessing the router via the
"192.168.2.1" address and going through the firmware update procedure
there, which seemed to work fine. When this was finished, I no longer
had access to the internet on any of the 3 computers utilizing the
router (1 wireless, 2 hardline). All of the lights on the router are
still lit, though, indicating that everything is OK. After I couldn't
get it to work I tried to access the router again with the
"192.168.2.1" address to try and undo the firmware update but that no
longer works either. I tried turning the router off and on, no help.
Finally I tried hitting the reset button on the router but that also
had no affect. I've checked the DSL internet connection by simply
unplugging it from the router and then directly into one of the
computers and that works fine. What can I do to fix this?
Thanks,
Aaron