I purchased a used A500 the other day and all seemed well with it at first. every 10 min or so it pops up with a demo and i cant seem to download google play to it. I started digging around in the settings and noticed that the build number is Acer_A500_1.109.02_PA_DEMO. Does this mean i purchased a demo model from a department store or something? Is there a way to make it work like any other A500 or am i just screwed. I have been fighting with trying to download google play since i got it and i am about ready to throw it out the window.