Apple has now closed the signing status of the iOS 15.7 (19H12) firmware, and now you can no longer flash these versions of the firmware by flashing.
Following Apple's de-signing of iOS 16.0.3 earlier this week about a week after releasing iOS and iPadOS 16.1 to the public, Apple on Friday also de-authenticated iOS and iPadOS 15.7 after rolling out iOS and iPadOS 15.7.1. This also means that users can no longer downgrade or upgrade to this version using the Finder or iTunes.
Apple usually turns off the verification of the old version of the system after the new version of the iOS system is released to encourage users to keep the operating system updated.
The official version of Apple's iOS 15.7.1 / iPadOS 15.7.1 was released at the end of October. iOS 15.7.1 is a minor update that Apple only said includes important security fixes.
The 15.7 version was released in mid-September. In addition to fixing security issues in Contacts, Maps, Safari, Safari Extensions, Shortcuts, and WebKit, the iOS 15.7 and iPadOS 15.7 updates also address several kernel vulnerabilities.
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