I was running into some issues so I just did a factory defaults on the LTN8704Q-P4 LTS model. After the reboot, it showed I had cameras connected but all showed up as offline.
This looks like some kind of clone of Hikvision, probably an OEM.
I have not looked-up the model, and am assuming it is an NVR (not a DVR with analogue cameras).
If you run Hikvision's SADP utility on a PC on the same network what does it tell you?
It should reveal the current IP address of the recorder.
It'll only show the IP addresses of the cameras if they are on your network (not if they are plugged into the rear of the NVR).