: As a last resort, removing the CR2032 coin-cell battery from the motherboard for at least 60 seconds may reset the system clock to factory settings, which can sometimes revert the device to a known default state.
❌ → Physical access + default password still allows anyone on-site to access footage or reset your system. dahua dvr default password
This will erase all settings (network config, camera channels, recording schedules) but usually not the recorded video footage on the hard drive. Dahua DVR Default Password: A Comprehensive Guide CMOS
This erases all previous settings including IP addresses, user accounts, and schedule recordings. Do this only if you have physical access to the machine and are prepared to reconfigure it. Warning: This erases all previous settings including IP