hi, i want to restore my 4s i got it as a present and it is a demo version made in 2010 and it has a lot of bugs, box says that it is assembled in france, there were lot of contacts mostly who lives in cupertino also some chinese people, it is loaded with many programs and games which say for demonstration use only, very strange iphone, im currently on 5.o, is there any way to restore it and preserve the baseband? i want it for unlocking, i have an r-sim which does not work with 5.1, so is it possible to update to 5.0.1 and preserve baseband?