: Email your full serial number and the current system date to official support. For North American users, the address is typically Support.USA@Dahuatech.com .
Choose "SN" or "QR Code" reset. A QR code will appear on the screen. Scan with DMSS: Open the DMSS app on your phone. Go to Home > Me > Toolbox > Device Password Reset . Scan the QR code on your monitor. dahua password reset by serial number