Device Firmware Update

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Device Firmware Update (DFU) mode is an alternative boot mode for systems running on Apple processors, such as iOS, iPadOS, tvOS, watchOS, and macOS 11 or later. In devices running on an Apple A12, S4, M1 processor or later, a seed bit is set in the Secure Enclave to protect keys for Class A, B, and C user data.

Usage

DFU is considered a deeper restoration process than recovery mode. As such, backing up data is stongly recommended before proceeding.

External links

• Revive or restore a Mac with Apple silicon with Apple Configurator 2 at Apple Support
  • Restore your iPhone, iPad, or iPod to factory settings (2021-08-12)
  • Restore your iPhone, iPad, or iPod touch from a backup (2020-12-22)
  • If you can't update or restore your iPhone or iPod touch (2021-09-23)

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