The Demo's are only put on there via Nokia themselves as there is no way to flash the software yourself, i know this because i deal with demo handsets, chances are you have a stolen handset my friend, as far as a i know there is no way to remove the demo content as it would be easily removed by customers in the shop, even if you do manage to find the demo content, you may even be prompted to enter an operator password, maybe not!?
See if theres an update for your phone, or try to find a task manager where you can switch off apps, but i'm guessing you won't be able to remove it and the update may even leave the demo content intact, i would personally speak with the seller if they're not co-operative then i would leave feedback reflecting that and maybe even speak with nokia themselves, being the good eggs that they are they may just give you a new one.
Alternatively you could brick the device and send it back to nokia claiming that it's a dead handset, you may / will need proof of purchase so again, speak with the seller and see what can be done, but if it's a hot handset then i'm afraid your **** out of luck on that one.
You may not need a receipt so maybe speak with an engineer first to see what can be done, it's a young phone so should theoretically be covered by some sort of warranty, worst case scenario is that it is stolen and nokia know about the phone, you send it off, they check on it and they retain it and your out of pocket.
Best case scenario, you speak with nokia, they exchange it for a new one, but i guess you'll have to take a risk to find that out.
Good luck m8.
