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Apple stops signing iOS 12.4, preventing downgrades to a jailbreakable firmware

We all knew it was coming, and now it’s official – iOS 12.4 is no longer being signed by Apple.

The Cupertino-based big tech company closed the signing window for iOS 12.4 late Wednesday evening, effectively preventing downgrades from the newer iOS 12.4.1 release, which was released more than two weeks ago to re-patch the Sock Puppet exploit that Apple inadvertently un-patched in iOS 12.4.

Apple no longer signing iOS 12.3-12.3.2, hindering downgrades from iOS 12.4

Apple is no longer signing iOS 12.3, 12.3.1, or 12.3.2 for its mobile device lineup as of Wednesday evening, a move that prevents users from restoring to any firmware version older than iOS 12.4, which was released to the general public just last Monday.

It’s not uncommon for Apple to stop signing older versions of iOS, especially a week or two after releasing a new update, but it’s particularly noteworthy that Apple stopped signing at least three iterations of iOS in one fell swoop this week, which doesn’t happen too often.