Dahua devices have a built-in security feature called the "Lock" or "Reset" function. If you enter an incorrect password multiple times (usually 5 times), the device locks you out for a specific duration. To bypass this without losing data, you can use the device's unique Serial Number to generate a temporary reset code.
There is a massive misconception online. Many users look for a "Dahua password reset by serial number" because they think they can just hold down a button. dahua password reset by serial number
Warning: This method fails often due to browser security restrictions (WebSocket errors). Method 1 (ConfigTool) remains superior. How to find the serial number
If you have a newer system, you might not even need to type in your S/N. Click "Forgot Password" on the login screen. Select QR Code as the reset mode. Step 5: Generate Reset Request
.bin) to that email.