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Hi @davw, I had exaclty the same issue and managed to get mine working again using an rs232 usb serial cable (very cheap), putty (free software to access the console via RS232) and TFTP server (more free software to expose the correct files for the NVR to be able to download them over your...

Well, I found several versions after my working version but none work with my unit. It accepts the image on a USB and goes through the motions but when it re-boots I just get a black screen after the logo, then it's into boot-loop. I've even tried updating via the console using the update.img...

OK, so I've recovered my machine via RS232 interface and a TFTP server with the last working firmware, so it's working again now but back on 3.210.0003.0 2017-04-18. The machine was in a boot-loop because the firmware upgrade to this latest firmware didn't work properly. Do I need to upgrade...

Hi Folks, I just tried this latest firmware on my NVR5216-16P-4KS2 and now it won't boot - I get the dahua logo screen, then a black screen. Prior to this I had system version 3.210.0003.0 2017-04-18. Am I missing something? Cheers, Pete.

Hi Bill, Did you resolve this? I have the same problem, no "IVS Enable" option on my General Settings page. I have a new NVR5216-16P-4KS2. Many Thanks, Pete.