HOWTO: Perform a Factory Rest On A Cisco 870 Router

1) Power off the Router
2) Press and hold the reset button
3) Turn the power back on
4) Within 60 seconds, send the break key/command. You should get a rommon. prompt on the screen
5) Type confreg 0x2142
6) Type reset. The router will reboot
7) When the router comes back up, you will be asked to configure it