Hello, MarkMiwurds.
How did you manage to reflash the DH_NVR5XXX-4KS2_MultiLang_V4.001.0000003.2.R.201010 firmware?
I have the same DVR. I tried to do the same upgrade and I am at the point that it reboots itself after the V4 screen.
I am using Putty and SolarWinds TFTp Server.
Using Putty...