Asking this kind of information with the only clue that is a chinese camera could be really complicated...as almost 99% of the cameras should be built in this country!
If you provide camera, a link with the camera model, etc, maybe (just maybe) someone could identify the camera and help you.
Hope it helps,
Paco
After more than 15 years, no longer using ZM as surveillance system.
Now in the dark side, using a commercial system...