Dahua Technology DHI-VTH1550CH-S - Password Reset and Product Info

5.2.7 Product Info
This box lets you reboot the system and format the SD card, if installed.
Press and hold Setting until the system displays the Password Verification dialog box.
Type your password and press OK.
Press Product Info.
Press Reboot and press OK at the prompt to reboot the VTH.
Press SD Format and press OK at the prompt to format the SD card.
5.2.8 Resetting the Password
Press and hold Setting until the system displays the Password Verification dialog box.
Type your password and press OK.
Press Forget Password.