I restored to ios 8.3 to see how it runs and then I put the phone in dfu mode to restore to 8.2 but the computer failed to recognize the iphone. Than I pressed both power and home button till the apple logo showed up to exit dfu mode. And now I restored to 8.2 and the screen keeps flickering on the bottom sides. This happened after I exit dfu mode on ios 8.3 and now on 8.2. Also itunes says my iphone is a 12gb model and on the phone it says 12gb capacity and 11.5 free. Now I turned off the phone to cool down a bit.