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iOS 15 is the fifteenth major release of the iOS mobile operating system developed by Apple for its iPhone and iPod Touch lines of products. It was announced at the company's Worldwide Developers Conference on June 7, 2021, as the successor to iOS 14 and released to the public on September 20, 2021.
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 ...
Apple released a significant security update for iPhones and iPads Thursday to patch newly discovered security vulnerabilities in the devices’ system software. The issue was discovered by ...
Apple provides major updates to the iOS operating system annually via iTunes and, since iOS 5, also over-the-air. [191] The device checks an XML-based PLIST file on mesu.apple.com [citation needed] for updates. Updates are delivered as unencrypted ZIP files. Updates are checked for regularly, and are downloaded and installed automatically if ...
iOS 13 is the thirteenth major release of the iOS mobile operating system developed by Apple for the iPhone, iPod Touch and HomePod.The successor to iOS 12, it was announced at the company's Worldwide Developers Conference (WWDC) on June 3, 2019, and released on September 19, 2019.
It was succeeded for the iPhone and iPod Touch by iOS 13 on September 19, 2019, and for the iPad by iPadOS 13 on September 24, 2019. 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.
iOS 16 is the sixteenth major release of Apple's iOS mobile operating system for the iPhone.It is the successor of iOS 15, and was announced at the company's Worldwide Developers Conference (WWDC) on June 6, 2022, alongside iPadOS 16, [3] and released on September 12, 2022.