when you want to write back the hive system to the XP.IMG,
first you have to mount it.
And at this point the problem appears, because this XP in XP.IMG has the same signatur and checksum.
Other USB sticks or harddrives you can connect, I tried.
The trick has to be, to put back hive system from nvme RD400 to XP.IMG without mounting it (or without underlying XP gets notice of that).
With Shadow Copy it can be done, but how without mounting?!
This would work
PS: You can copy the hive system back to the USB stick, where the XP.IMG stays on.
But later you have to put it back into XP.IMG, mounted on other XP.