I installed my new S4 pro NVR system with the 4 bullets and only installed one initially then just hooked up my second after a couple weeks of only running on the one. I am not able to see the camera, like the cable is bad or something. The camera has the blue flashing light so I know it’s getting power. I have cycled the power on the NVR but still nothing. I’m thinking maybe the firmware isn’t updated on the one I just hooked up but it won’t let me do a firmware update since there isn’t one available. There was with the first camera but not now. Any advice?