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Test Description goes like this
Before updating firmware, it's wise to backup the device's configurations to prevent losing settings in case of an update interruption.
and copy the downloaded firmware file to the root directory. Perform the Upgrade Plug the USB drive into the DVR/NVR USB port. Navigate to Main Menu > System > Upgrade Info > Version > Start depending on your UI). Select the firmware file from the USB and click Start/Upgrade Restart & Reset cp plus firmware update new