[NVR-420] How to use the reset button to reset the NVR to factory default?

Step1. Unplug the DC power. Press the reset button on the back panel.
Step2. Hole the reset button and connect the DC power
Step3. Keep pressing the reset button till all the LED on the front panel start to spark.
Step4. Release the reset button; wait while the LED starts sparking. Then the process is done and the device will be reset to factory default.