Just came across a V5 firmware for the I series (c), any ideas, as I thought this model was EOL?
https://www.hikvisioneurope.com/eu/portal/?dir=portal/Technical%20Materials/02%20%20NVR/00%20%20Product%20Firmware/04%20I-series/76%2077%20NI-I%28C%29
NVR_K21B1_BL_ML_STD_V5.01.060_240110.zip