I am totally new to this tablet, 69 years old and counting. Bought a Acer Iconia A700 off ebay from a guy whom said that is was new store demo never used new condition. Well it is missing the navigation bar, circle in the middle of the bar, and the status bar. My question is if i replace the OS with a newer version from the 4.0.4 will it replace the system bar at the bottom of the screen. Or is there something in this tablet to restore it if it was hide. Acer says that it is a hardware problem, send it in for repair. If every thing works on this tablet except that when u get in an app you got no way to get out except reboot. Any help would be appreciated. Thanks ahead of time