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Is there no way to upgrade new version NVR firmware with this one?

All don't work

That's the message it displays.

Yes, have tried other cameras and they too don't connect including brand new ones.

I have reset the camera manually but still having the same problem, it loops on detecting then stops and again loops.

Thx, I try this and share status of the outcome.

The camera works perfectly when connected to other NVRs. It was connecting well to this NVR too and was working perfectly but then stopped.

It's plugged direct to the NVR, if connected to another NVR, it functions perfectly well. The camera was sealed when I got it from hikvison. It works well on other systems but no camera is working on this NVR but someone told me if it's upgraded, it may work.

DS-2CD2120F-I

V3.4.106, Build 191009

I have tried to upgrade to ver 106 but still can any camera connect to my NVR (DS-7616NI-E2/16P) Any solutions, please help.