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On iPhone, iPad, Apple Watch, iPod Touch, and Apple TV devices, the boot ROM is called "SecureROM" [8] It is a stripped-down version of iBoot. It provides a Device Firmware Upgrade (DFU) mechanism, which can be activated using a special button combination. [9]
[5] [6] [7] If iBoot fails to load or fails to verify iOS, iPadOS or macOS, the bootloader jumps to DFU (Device Firmware Update) [8] mode; otherwise it loads the remaining kernel modules. [ 2 ] [ 9 ] Once the kernel and all drivers necessary for booting are loaded, the boot loader starts the kernel’s initialization procedure.
DFU may refer to the following: ... Device Firmware Upgrade mechanism, for USB devices; Diabetic foot ulcer; Drain fixture unit, a unit of measure in plumbing
IPSW is a file format used to install iOS, iPadOS, tvOS, HomePod, watchOS, and most recently, macOS firmware for devices equipped with Apple silicon. [3] All Apple devices share the same IPSW file format for iOS firmware and their derivatives, allowing users to flash their devices through Finder or iTunes on macOS or Windows, respectively.
A power-on self-test (POST) is a process performed by firmware or software routines immediately after a computer or other digital electronic device is powered on. [ 1 ] POST processes may set the initial state of the device from firmware and detect if any hardware components are non-functional.
An over-the-air update (or OTA update), also known as over-the-air programming (or OTA programming), [1] is an update to an embedded system that is delivered through a wireless network, such as Wi-Fi or a cellular network. [2] [3] [4] These embedded systems include mobile phones, tablets, set-top boxes, cars and telecommunications equipment.
Users who have automatic updates enabled on their device will be updated automatically to the new AOL app experience. Turn automatic updates on. On your device, tap Settings. Scroll down | Tap App Store. Tap the slider next to App Updates. - If the slider is grayed out, check to see if your device has lower power mode turned on.
According to the Apple white paper, iOS includes a Device Firmware Upgrade (DFU) mode, and that "[r]estoring a device after it enters DFU mode returns it to a known good state with the certainty that only unmodified Apple-signed code is present." [14]