[Q] Note 3 Live demo unit N900x Retail Mode topic

I have a Samsung Galaxy Note 3 N900X Live Demo Unit which contains retail mode i want to know how to delete retail mode or keep it from coming back on to the demo video , i already tried going to config and entering pass to disable retail mode but that does not work. Is there any way to use it without retail mode or flash a stock rom without the modem file or something?
Thanks in advance!
Your help will be highly appreciated