Postagem original de: akira2800 ,
Try putting your phone into DFU mode. To do that press and hold down both the Power and Home buttons until you see the Apple logo. After it appears, let go of the power button and keep holding down the Home button until you see a screen that says to connect to iTunes. Plug it into your computer and it should say that your phone is in restore mode. Click on Restore and see if that works.