WZR-600DHP Reset button not working

[jim@jdanders.com]

I have forgotten my username and password for my router which I set up a few years ago.
I have attempted to reset it with the reset button on the bottom using all procedures I have found on the buffalo website as well as information found when doing a Google search online.
The reset button does not seem to work no matter what procedure I use.
The router's IP address stays the same as what I originally set it to (192.168.1.1).
I cannot access it with any of the default usernames and password combinations.
How can I reset this router?

Any help would be appreciated.