Hello,
I added my ringbell DS-KV6113-WPE1(C) in my old NVR DS-7608NXI-K1 (firmware v4) with no issue. I can access camera and make trigger with motion detection.
I bought a DS-7608NXI-I2 (firmware v5) but impossible to add the ringbell with HIKVSION protocol.
It works with HIKVISION_RSTP...