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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 ...
UDID is an acronym for Unique Device Identifier. The UDID is a feature of Apple's devices running iOS, tvOS, watchOS, and macOS.It is a unique identifier that is calculated from different hardware values, such as the ECID.
Until iOS 10, all the firmware files (including the root file system and Restore and Update ramdisks) were encrypted. While Apple does not release these keys, they can be extracted using different iBoot or bootloader exploits, such as limera1n (created by George Hotz , more commonly known as geohot ).
Verified for iOS 9.3 and later. 1. Double press the Home button or swipe up and hold. 2. Swipe up on the image of the app. 3. Re-launch the app and attempt to reproduce the issue.
Some devices include a backup copy of their firmware, stored in fixed ROM or writable non-volatile memory, which is not normally accessible to processes that could corrupt it. Should the firmware become corrupted, the device can copy from the backup memory to its main memory, restoring the firmware.
Prior to the release of iOS 17.1, some users reported that their iPhone 15 series phones were experiencing screen burn-in. Apple fixed this issue with iOS 17.1, and clarified that the issue was image persistence, as opposed to screen burn-in, which it was being referred to at the time. The difference is that screen burn-in is a hardware issue ...
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Later iPhone models are able to be activated and set-up on their own, without requiring the use of iTunes. iTunes also allows users to backup and restore the content of their Apple mobile devices, such as music, photos, videos, ringtones and device settings, [74] and restore the firmware of their devices. However, as of iTunes 12.7, apps can no ...