オリジナル投稿者： Chris Mason ,
Hi Have you tried putting the phone into DFU mode and then restoring? Plug your iPhone into your computer and open iTunes. It doesn’t matter if your iPhone is on or off. Press and hold the Sleep / Wake Button and Home Button together for 8 seconds. After 8 seconds, release the Sleep / Wake Button but continue to hold the Home Button until iTunes says “iTunes has detected an iPhone in recovery mode" Let go of the Home Button. Your iPhone’s display will be completely black if you’ve successfully entered DFU mode. If it’s not, try again from the beginning. Restore your iPhone using iTunes.