Dahua NVR52-4KS2 Series User Manual page 459

Step 2 Restore the settings.
Default: Restore all the configurations except network settings and user management
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to the default.
Factory Default: Restore all the configurations to the factory default settings.
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5.19.4.3.2 Resetting Device through the Reset Button
Background Information
You can use the reset button on the mainboard to reset the Device to the factory default settings.
After resetting, all the configurations will be lost.
The reset button is available on select models.
Procedure
Step 1 Disconnect the Device from power source, and then remove the cover panel. For details
about removing the cover panel, see "3.3 HDD Installation".
Step 2 Find the reset button on the mainboard, and then connect the Device to the power
source again.
Step 3 Press and hold the reset button for 5 seconds to 10 seconds.
Figure 5-322 Default
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User's Manual