Files attached are mtd6r0_mod.zip that did not require and changes.
Yes, agreed, as you've indicated the file is OK. And the fixuplog.txt is good too, a normal run.
The version 5.4.5 firmware works OK for use in Stage 3, and the updater was happy with it.
So after the final power cycle a no-show even in SADP? Curious.
So there is some other underlying cause preventing the cameras from working properly.
There are several possibilities, which connecting to the serial console would shed some light on.
It's probably one of these things where in spending more time on the problem isn't worth it on a cost/benefit basis, unless it's mainly for the satisfaction that comes from spending time problem solving.
Do you think the previous owner had a go at CN to EN conversion and didn't get there properly?
I've seen one Hikvision trap aimed at catching such attempts.
Attached are a couple of old firmware versions to try that should be able to be applied using the Hikvision
tftp updater.
Ruthven - Scotland?