Select your NVR and click the "Forgot Password" or "Reset Password" icon.
Navigate to Settings (Gear icon) > System > Default .
If you cannot log in, software resets are impossible. You must open the chassis.
You will need a Security Code (usually a QR code or a string of text displayed on your monitor connected to the NVR).
If you see a jumper cap over two pins, move it to the adjacent two pins for 10 seconds, then move it back. Step 4 (Button method): Press and hold the small button for 15–30 seconds using a non-conductive tool (plastic spudger).
Remove the cover screws and slide off the top casing.
Log into the NVR directly via a monitor connected to the HDMI/VGA port, or log in via a web browser (using the NVR’s IP address).
Dahua provides an official tool called (available on their download portal).