Apple stops signing iOS 15.5 after iOS 15.6 release

Apple on Wednesday stopped signing iOS 15.5 and iPadOS 15.5, exactly one week after the company released iOS 15.6 and iPadOS 15.6 for all users. Therefore, iPhone, iPad and iPod touch users can no longer upgrade from iOS 15.6 to iOS 15.5, which may affect users awaiting jailbreak.

iOS 15.5 was released on May 16 with minor improvements to Apple Cash and Apple Podcasts, as well as other bug fixes. iOS 15.6 was released to the public on July 20 with a new option that allows users to pause or rewind a live sports game in the Apple TV app. The update also fixes bugs and security flaws.

These exploits could trick malware into executing arbitrary code with kernel privileges in the operating system. This is the main reason why Apple does not allow users to downgrade their devices, as older versions of iOS are more susceptible to security vulnerabilities.

You can read the release notes for iOS 15.6 below:

  • The TV app adds the ability to restart a live sports game already in progress and pause, rewind or fast forward.
  • Addresses an issue where Settings may continue to show that device storage is full even though it is available.
  • Addresses an issue that may cause Braille devices to become slow or unresponsive when navigating through text in Mail.
  • Fixes an issue in Safari where a tab may jump back to a previous page.

Downgrading from iOS 15.6 is no longer possible

Rolling back to older versions of iOS is often used by those who jailbreak their iPhones and iPads. Earlier this month, Odyssey Team announced that they are working on the first jailbreak tool for devices running iOS 15. However, due to strong system protections, this tool will only work with versions from iOS 15.0 to iOS. 15.1.1.

The developers behind the jailbreak tool said they are working to extend version support up to iOS 15.4.1, but it will take even longer. Of course, if you’ve updated your device to iOS 15.6, there’s no way to roll back to those versions.

Restoring an Apple device to a previous version of iOS can also sometimes be useful for users who experience significant bugs after upgrading to the latest version of iOS.

Unfortunately, if you had any issues with iOS 15.6, you’ll now have to wait for a future update rather than downgrade to iOS 15.5. Currently, Apple is working on the beta version of iOS 16, which should be available to the public this fall.

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