Most of the JVC head unit you have to enter the menu to turn the demo mode off. I have the HD50R model, and the way I had to do it was, hold down the menu button (will take you menu mode), first option was the demo, selected the demo by pressing the volume button, then using the volume button again, scrolled it to off and press the volume button to accept changes. To exit out of the menu mode press the menu button and will take you back to play mode....
I can't say this method will work with your deck as you didn't list the model of your HU. But give it a try???
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