原帖由： Paige Reisman ,
First I would suggest trying a hard reset on the phone. If that doesn't work, you could try doing a more in-depth restore, such as putting the phone in DFU mode. Here are a couple of articles that could provide guidance on how/when to perform such a restore: https://www.engadget.com/2011/05/25/iphone-101-what-is-dfu-mode-and-whats-the-difference-from-rec/ http://www.payetteforward.com/how-to-put-iphone-dfu-mode/ Keep in mind that any type of restore on your phone will delete all contents that were not previously backed up on iTunes/iCloud. Good luck!