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Go to Configuration > System > Maintenance > Upgrade .

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Updating your DVR/NVR is a manual process that requires a USB drive and care to prevent power failures. Format a USB drive to FAT32. Go to Configuration > System > Maintenance > Upgrade

If your device has a visible brand name, always bypass third-party blogs. v402r11 h264 h265 dvr nvr firmware download exclusive

The firmware file does not match your mainboard hardware revision or channel count. Check your motherboard layout version again.