when i upgraded to 2.0 i suddenly can't change my wallpaper. i know the wallpaper is the background from sleep mode. i tried changing the wallpaper from the settings then general then wallpaper using the stock wallpaper and set it as wallpaper it won't change then i tried from my photos then choose a picture then set as wallpaper but it still didn't change my wallpaper. anyone can help? already tried soft reset and tried turning off the touch still no luck.