A factory reset will revert the device back to its original factory settings. To begin the process, you will need to remove the DVR cover. Use a Phillips head screwdriver to remove the screws on the back/sides of the DVR. Once the screws have been removed, lift the lid to expose the DVR's motherboard. Please make sure the DVR is powered on as well to complete the process.
On the motherboard, you will notice a small black button. This is the factory reset switch for your DVR:
To factory reset the DVR, press, and hold the factory reset switch for 4 – 5 seconds and unplug the power adapter. Once power is removed from the unit, press, and hold the factory reset switch for an additional 4 - 5 seconds and power plug the adapter back into the unit. Continue pressing the factory reset button until you hear a beep and release. The device will be reset to its original factory settings.