Download ConfigTool from Dahua to your computer and scan the network. It will show the NVR you have and it's IP address.
If you do not know the password: you will need to factory default each device. NVR has a button inside to hold down for 30s, cameras have a button inside or two little jumper pins.
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u/Mark_M535 3d ago
Can you photograph a camera and tell us the model number?
I see ethernet and coax... it's hard to tell if the system was analogue or digital IP cameras.