If you experience an issue where you have a new NVR using the latest firmware and some existing cameras using older firmware, they may not initially work together.
The reason for this is the new NVR firmware could be looking for components of a newer camera firmware that is not present on the version of firmware loaded on the camera.
The solution will be to update your camera firmware to the latest version.
All the latest camera firmware version can be found on the link below:
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