Apple stops signing iOS 17.6 system, upgraded iPhone users can no longer downgrade

Thanks to netizen OnEmoReT1Me for submitting the clue! According to news on August 16, Apple stopped signing iOS 17.6 version system today, preventing iPhone users from downgrading to this version. Apple has released the iOS 17.6.1 update on August 8.

1. Apple periodically stops signing older versions of iOS, usually within a week or two after a new version is released.

2. When Apple stops signing an update, it will no longer be able to install on iPhone due to server-side software verification checks, so those who have updated to the latest version of iOS will not be able to downgrade.
3. Preventing downgrades encourages users to keep their operating systems up to date and install the latest security fixes.
4. As previously reported, iOS 17.6 focuses on introducing security fixes, while iOS 17.6.1 contains "important bug fixes" and resolves an issue that prevented advanced data protection features from being enabled or disabled.

How to upgrade iOS / iPadOS / watchOS / macOS development version and public beta version?

1. Upgrade to the iOS/iPad OS 18 developer preview version and public beta version, you can refer to the experience shared by friends: Experience Post 1||Experience Post 2||Experience Post 3||Experience Post 4.
2. Starting from iOS/iPadOS 16.4 Developer Preview Beta 1, you need to register for the Apple Developer Program. After registration, open the system [Settings] [Software Update] to see the upgrade option. Note that your iPhone or iPad must be signed in with the same Apple ID you used to sign up for the Apple Developer Program in order to see the upgrade option in Settings.
3. In future iOS and iPadOS releases, this new setting will be the way to enable developer previews and public betas, and configuration profiles will no longer grant access.

   

   Attached is the Apple iOS firmware download history: "Apple iOS/iPadOS/macOS firmware download/update log"

The above is the detailed content of Apple stops signing iOS 17.6 system, upgraded iPhone users can no longer downgrade. For more information, please follow other related articles on the PHP Chinese website!