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The careful organization of these components ensures that the device not only runs smoothly after an update or restore but also maintains security by verifying the integrity of the firmware files. The inclusion of SHSH blobs, which are required for validating firmware restoration, further demonstrates the controlled environment that Apple ...
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 ...
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The most common data recovery scenarios involve an operating system failure, malfunction of a storage device, logical failure of storage devices, accidental damage or deletion, etc. (typically, on a single-drive, single-partition, single-OS system), in which case the ultimate goal is simply to copy all important files from the damaged media to another new drive.
Firmware hacks usually take advantage of the firmware update facility on many devices to install or run themselves. Some, however, must resort to exploits to run, because the manufacturer has attempted to lock the hardware to stop it from running unlicensed code. Most firmware hacks are free software.
Soon after, Apple issued a formal apology, admitting that it initially believed that the issues were caused by iOS bugs and "normal, temporary" performance decreases following an update, but that "continued chemical aging" of batteries in older iPhone devices was also a factor.
NOR-based flash has long erase and write times, but provides full address and data buses, allowing random access to any memory location. This makes it a suitable replacement for older read-only memory (ROM) chips, which are used to store program code that rarely needs to be updated, such as a computer's BIOS or the firmware of set-top boxes.
[21] iPhone OS 1.1.4 was the final iPhone OS 1 update for the first-generation iPhone prior to the release of iPhone OS 2, and was released on February 26, 2008, while iPhone OS 1.1.5 was the final iPhone OS 1 update for the first-generation iPod Touch and was released on July 15, 2008 after the release of iPhone OS 2, to users unwilling or ...