Sorry, I am totally confused as a HikVision newbie. I have bought and installed a NVR and four Cameras recently.
NVR is: DS-7608NI-I2/8P
Cams are: DS-2CD3T86G2-4IS
I successfully upgraded the Cam Firmwares to v5.5.153 build 200827 using this download:
Cam Firmware (Technical Materials Folder)...