Home Security Systems
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We would have to determine the maker and model # ***** the DVR, in order to get anything from it, I think.
Look on the underside for a manufacturer's label with the maker and the model # ***** it.
It might be on the back side of the device, also.
If all else fails, try a default passcode like
and see if it is set to any of those.
Did you look on the back side, or the underside, of the device?
The manufacturer's label is often there. If it is not there, your device may be fly-by-night originated (since *any* electronics equipment really does have a label identifying it, usually with serial number as well as maker and model number.)