If your iPhone gets stuck with the following message: support.apple.com/iphone/restore, most of the time you will see a black screen due to a software problem.

Application related issues,

Update failure,

iOS 15 Beta Downgrade or Restore Issues,

Operation that causes iOS to malfunction on iPhone etc.

It's important to emphasize that all 13 of the latest recently announced iPhones will run on iOS 15. Therefore, you may encounter this type of issue that Apple restores during a new update. Also, keep in mind that in most cases all publishers need to update their applications quickly to be supported by the latest version of iOS.