Connect a terminal emulator to the 9-pin serial port in the back. 9600 baud, N-8-1. Power-cycle the device. When it starts to boot, hit ESCAPE. You should see a prompt that says "bootstrap#". Type "bypass password" and hit ENTER. Type "boot" and hit ENTER. When it finished booting you can type "enable" and log in with no password, then configure new passwords.