Hi, I have struggled for weeks trying to replace a faulty camera with a new dahua ipc-hdw2441t-s 4mp ip camera. I have an old dahua dhi-nvr4208-8p. I managed to connect to the new camera with a PC using IE and also initialize the camera with ConfigTool. I keep getting Conf.LoginErrorNo-20 and I do understand this error means combability issue with new camera and old NVR and perhaps a new firmware will do the trick. The current firmware I have is 3.201.0000.1.R / 2016-04-09 Build date / 3.1.0.65833 Web. Just wondering if anyone has any experience and solution for this issue. TIA