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The .ipsw file itself is a compressed archive file (renamed Zip archive) containing at least three Apple Disk Image files with one containing the root file system of the OS and two ram disks for restore and update. tvOS, audioOS and macOS also include a disk image for the recovery environment (recoveryOS).
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 ...
iOS jailbreaking is the use of a privilege escalation exploit to remove software restrictions imposed by Apple on devices running iOS and iOS-based [a] operating systems. It is typically done through a series of kernel patches.
iOS 12 is the twelfth major release of the iOS mobile operating system developed by Apple.Aesthetically similar to its predecessor, iOS 11, it focuses more on performance than on new features, quality improvements and security updates.
The feature was initially only available on the iPad (1st generation) until the release of iOS 4 a few months after the release of iPhone OS 3.2, which brought the feature to all iPhone and iPod Touch models that could run the operating system, with the exception of the iPhone 3G and the iPod touch (2nd generation) due to performance issues ...
iOS 8 is the eighth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 7.It was announced at the company's Worldwide Developers Conference on June 2, 2014, and was released on September 17, 2014.