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Look, you can try the camera that works on the channels that don't work for you,
the problem may be several
You need to check the cameras loaded, you need to check the cable with which you are connecting the cameras
If tido is fine, then the problem may be internal,
check what he said, if it doesn't work let me know to help you
My devr when I enter the information on the hard drive only tells me the brand of the disk but does not present the ability k has nor the storage of what is recorded just says on the right unformatted and formatted and does nothing help for f