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Hi All, I have an older DS-7716NI-E4 NVR with 6 bullet (DS-2CD2042WD-I) and 6 turret (DS-2CD2342WD-I) cameras in place. I am looking to upgrade a few of the turret cameras to 4K with audio if there are ones available and compatible to the NVR. The audio is the more important factor. Too...

The whole firmware update seems confusing and I hope someone can explain this... I have read the post on the serial number explanations and understand that WR in the serial means it a world wide version and not chinese. However, the NVR doesn't follow this like the cameras. I have "AARR"...