Reload the router, press the BREAK key
to abort the bootup, and the prompt
enter "config-reg 0x2142" (this means
to ignore the NVRAM config), then
"i" (reload), and the box should come
up without using it's config. Then
do a "config mem" (load the NVRAM config),
change the config-register back (config-reg
0x2102), and do a "show run" to see
your config.