PlayStation 4 IDU Mode

I recently made a post here about 5 PS4 that refused to turn on. I managed to fix 3 out of the 5. What I have found is all 3 of these appear to be a retail demo unit. I have taken each hard drive out, wiped it on my computer and reinstalled the OS. Every time I do that, it just loads back up into IDU mode. These are all running version 6.72. I would really like to get these consoles out of IDU mode, as it would be a shame for the not to be able to be used. Any and all help is appreciated. Thanks!

There is likely a certain chip on the mainboard that causes it