Q: how to factory reset demo unit

Did you try Settings>General>Reset>Erase all content and settings? That erases the iPad.

Yeah ...of course, its a demo. There would be no way for someone to erase it. That makes sense. Does it have some sort of profile that prevents changing the settings, I imagine?

this website might be helpful, but I do not see error code 3149 on it.

http://support.apple.com/kb/TS3694

Are you running the latest version of iTunes?

Message was edited by: Demo

I assume that you've seen this but just in case....

Error 1 or -1

That's great. Now you can sleep in peace tonight!

Can a demo unit of iphone can work and perform same as to a real iphone?

I think i was scammed by unknown person

The features are working like camera, message even iTunes.

My iphone worn turn off and the charging port has something that the charger couldn't fit and we couldnt make the sim tray to come out.

Here is link how to unlock demo unit to normal one.

https://youtu.be/dP2t6Opnwgo

In case you didn't notice, you responded to a post that is 18 months old now. I would hope the problem was resolved last year.

I know, but in case someone have same problem as I had, so I decided to share with video I found.