オリジナル投稿者： John Doe ,
I had the same problem after Backing Up my iPhone 5c and trying to update to the latest iOS, after trying hard resets and the other suggestions in these answers but didn't work. After taking to Apple they offered to replace my phone free of replacement charge (it was out of warranty) because it is a known issue and it was the update that caused it. Hope this helps anyone in a similar situation. AP.