DFU File Documentation

Overview

Feature Value
File Extension .dfu
Full Name Device Firmware Upgrade File
Primary Usage Firmware updating for iOS devices
File Format Type Binary
MIME Type application/octet-stream
Developed by Apple Inc.
Encryption Potentially encrypted depending on firmware requirements
Compression Not typically compressed
Signature Presence Yes, to verify the authenticity of the file
Common Tools for Creation Xcode, iTunes
Common Tools for Application Apple Configurator, iTunes, third-party tools
Compatibility iOS devices in DFU mode
Major Purpose To initiate and complete firmware upgrades on iOS devices
Security Features Signature verification, potential encryption
File Header Specificity Contains unique headers to identify the file type and version
Modifiability Typically not meant to be modified by end-users
Integration with iOS Deeply integrated for firmware management and recovery
Update Mechanism Direct replacement or patching of existing firmware
Specially Designed for Recovery and Update processes of iOS devices
Unique Identifier Each file has identifiers for specific device models and firmware versions