OK guys, I think we may be on to something! Read back through the thread and you will see that as a result of Marku2's suggestion I did two things: 1/ I recorded the information from SADP which relates only to the NVR, said software v3.4.95 build. Great - if that means what I think it means (it does not say anything about firmware) 2/ Marku2 also requested that I unplug all cameras (8) which I have done and this is how they remain. So, should I now plug all the cameras back in and interrogate with SADP to obtain data? The NVR has a separate port for LAN which is permanently plugged into my PC, where the SADP program resides so no need to leave any cameras excluded from this process. If we go slowly, step by step through this process, I may be able to do this myself???