Please follow the steps below:
1) Unplug the power jack to turn off the power of the camera.
2) Insert a pin into the reset hole as circled in red in the figures below. Sense a button and keep it pressed until instructed to release.
3) Plug in the power jack to turn on device, in about few seconds the status LED will be flashing quickly.
4) Release the button (remove the pin from the reset hole). The camera should now be back to factory default.
5) Login the camera using the default IP (http://192.168.0.20), and username (admin), password (admin).