Try a Hard Reset:
Hard Reset (aka 30/30/30 reset):
The following procedure will clear out the NVRAM and set dd-wrt back to default values:
- With the unit powered on, press and hold the reset button on back of unit for 30 seconds
- Without releasing the reset button, unplug the unit and hold reset for another 30 seconds
- Plug the unit back in STILL holding the reset button a final 30 seconds
The connect a ethernet cable to the router and connect via internet explorer to the router's default IP Address 192.168.1.1 or 192.168.0.1
Username: admin
Password: admin