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This is achieved by only transferring the differences between the old firmware and the new firmware, rather than transmitting the entire firmware. A delta of the old and new firmware is produced through a process called diffing; then, the delta file is distributed to the end-device, which uses the delta file to update itself. [8]
The iPhone 7 Plus received an exclusive portrait camera mode in the iOS 10.1 software update. [61] This camera mode is capable of producing a bokeh effect using depth of field analysis of the second camera of dual-lens in the back of iPhone 7 Plus. Mainstream software support for the iPhone 7 was dropped when iOS 16 was released.
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.
The U.S. government ordered Apple to produce an IPSW file that would allow investigators to brute force the passcode of the iPhone. [7] The order used the All Writs Act, originally created by the Judiciary Act of 1789, to demand the firmware, in the same way as other smartphone manufacturers have been ordered to comply.
This is an especially big concern for embedded devices, in which upgrades are typically all-or-nothing (the upgrade is a firmware or filesystem image, which isn't usable if it's only partially written), and which have limited ability to recover from a failed upgrade. [5]
Apple later released a support document stating that this was due to an expired device certificate and that devices that supported iOS 7 should update to it to resolve these issues, [26] and that devices unable to run iOS 7, the fourth-generation iPod Touch and the iPhone 3GS, should upgrade to iOS 6.1.6. [26]
System 7.5 Update 2.0 – Thag (from The Far Side), Zhag [91] System 7.5.2 — Marconi (in reference to Guglielmo Marconi) [91] System 7.5.3 – Unity ("contains all patches and special software") [91] System 7.5.3 Revision 2 – Buster (Amelio's high school nickname) [91] System 7.5.5 – Son of Buster (picked for the "SOB" acronym) [91]
iPhone OS 3 was the last major version of iOS for which there was a charge for iPod Touch users to upgrade. Starting with iOS 4, iOS upgrades became free for all users, including users of the iPod Touch, as the Sarbanes–Oxley Act was revised to allow software upgrades for free with hardware that is not subscription-based.
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