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2. iOS 12 - Wikipedia

   en.wikipedia.org/wiki/IOS_12

   Security updates for iOS 12 continued for four years after the releases of iOS 13 and iPadOS 13 for devices unable to run the newer versions. The last update, 12.5.7, [2] was released on January 23, 2023.

3. SHSH blob - Wikipedia

   en.wikipedia.org/wiki/SHSH_blob

   SHSH blobs are created by a hashing formula that has multiple keys, including the device type, the iOS version being signed, and the device's ECID. [5] [non-primary source needed] When Apple wishes to restrict users' ability to restore their devices to a particular iOS version, Apple can refuse to generate this hash during the restore attempt, and the restore will not be successful (or at ...

4. iOS version history - Wikipedia

   en.wikipedia.org/wiki/IOS_version_history

   The release of iOS 8.1 brought support for the iPad Air 2 and iPad Mini 3, and the release of iOS 8.4 brought support for the iPod Touch (6th generation). iOS 8.3 was the first version of iOS to have public beta testing available, where users could test the beta for upcoming releases of iOS and send feedback to Apple about bugs and issues. The ...