I've moved into a property and inherited a Hikvision system with 5 POE cameras. The NVR is a DS-7608NI-K2/8P, with 4 DS2CD2363G0-I cameras and 1 DS-2CD2355FWD-I cam. I haven't been left with any instructions or passcodes, and it seems like it's all relatively up to date, with the NVR being on...