chinese firmware

Any idea how to initialize ip cameras (like dahua) on a xiongmai nvr? I bought the nvr off Aliexpress. but finding a hard time initializing camera in it. any direction on how to do that?

I am chatting with an eBay seller of open-box merchandise and they have a Dahua IPC-HFW4431R-Z available. He had the photo saying English firmware but when I asked him he said he wasn't sure. So I have 2.5 questions: 1) Is there anyway to tell from the box, without plugging the camera in...