HELP - USR8022 firmware upgrade failed

Hello,

When I tried to upgrade the firmware of my USRobotics 8022 wireless router,
the router hung and now it doesn't work anymore. When I try to access the
configuration utility (using the browser) all I get is a message saying
"upgrade not completed". I've already tried a hardware reset, with no luck.

I have tried to ftp to the router, and it responds but I don't know any
userid and password to login - I guess there should be some secret factory
default.