If you can still log in to the NVR, you can perform a factory reset through the system menu:
If you do not have internet access at the location or do not recall the security email, Dahua has a secure challenge-response system. This method is the most reliable answer for for technicians. how to reset dahua nvr without reset button
If you find yourself locked out of your own security system and cannot locate a tiny pinhole button on the back or bottom of the unit, do not panic. There are several effective methods to hard reset the NVR without a physical button, restoring factory default settings and access. If you can still log in to the
: Look for two small solder points on the board, often labeled , typically located near the HDMI port or power socket. Short the Points There are several effective methods to hard reset