Also the problem with endless false motion detection using NVR still not solved. The last working camera firmware without problem is 5.5.4
See main thread here (it is closed for some reason) - Latest HikVision Firmware for EasyIP 3.0 Cameras - new V5.5.51 (G1 Series cameras)
I've tested using connected NVR 7608-K2 (latest firmware STD_V3.4.101_180904) and it says camera doesn't support sub-stream.
If logging to camera directly sub-stream works fine.