DFU (Device Firmware Upgrade) mode and Recovery mode

DFU (Device Firmware Upgrade) mode and Recovery mode

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DFU Mode vs Recovery mode - DFU (device firmware upgrade) mode is a special mode that bypasses the operating system and lets you upgrade the device. When in DFU mode, the phone will have no display on the screen.

Recovery/Restore mode is more common. When in Recovery mode, the phone will have a connect to iTunes graphic on the screen. In this mode you can also restore or upgrade your device, but it is not as drastic as DFU mode.

Many restore problems can be solved by using DFU mode.

取自"http://www.iphone.org.hk/wiki/index.php/DFU_%28Device_Firmware_Upgrade%29_mode_and_Recovery_mode"