From the FAQ

The info in this article also applies to the following products:
F5D5231-4 4-Port Router
F5D6230-3 Wireless Cable/DSL Gateway Router (11Mbps)
F5D6231-4 802.11b Wireless Cable/DSL Gateway Router
F5D7230-4 Wireless G Router
Resolution
With the router powered on, press and hold the reset button for exactly
seven seconds, this will restore the router to factory default.

Note: By default the password on the router is left blank, and the
default IP address is 192.168.2.1

Summary
This article describes how to reset the router to factory default
More Info
This article assumes you cannot access the routers web interface.


MLF