Good question, I know there are reverters for PS3 but I haven't seen a PS4 one yet.. anyone else?
According to the Google gods many who have came across a PS4 stuck in Kiosk Demo mode have contacted Sony who offered to swap it out for a retail PlayStation 4 console.
Update: Here is a payload to exit PS4 IDU Mode if anyone needs it:
Exits IDU Mode
Should "turn off" when it's done, just hold the power button after the screen turns off. When you turn it back on you should be out of IDU mode