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Device Firmware Upgrade (DFU) is a generic mechanism for upgrading the firmware of USB devices with improved versions provided by their manufacturers, offering (for example) a way to deploy firmware bug fixes. During the firmware upgrade operation, USB devices change their operating mode effectively becoming a PROM programmer. Any class of USB ...
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
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]
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.
[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.
The program uses a bug in the USB code of the firmware for the iPhone and the iPod Touch, allowing unsigned code to be executed. [1] blackra1n uses this exploit to patch the firmware of the iPhone or iPod Touch while in DFU (Device Firmware Upgrade) mode. This mode is used when upgrading firmware through iTunes, but also can be activated by the ...
These devices are designed to be resistant to being bricked. A bad firmware load is easily recovered by holding a special pin in the active state, which caused the chip to boot up using its internal factory ROM, which makes a programming interface available through its built-in USB controller. DFU can be viewed as a form of debug port ...
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]