This article will explain the differences in recovery mode (Recovery mode) and DFU mode (Device Firmware Update).

The recovery mode uses iBoot (ie the boot IOS software) for restoring or updating your iPhone, iPad or iPod, while the mode DFU override iBoot and uses the seed plant equipment.

The value of mode DFU is that there is no control advanced software that could prevent a downgrade (downgrade) for example.

iBoot is in fact what is called a boot loader (bootloader) iOS. iBoot is used primarily to verify that you are upgrading from a version greater than or equal to the version currently installed on your iPhone, iPod touch or iPad. If this is not the case, iBoot prevent the update to continue.

So why the downgrade (downgrade) or some jailbreak, and mode tethered, must be made in DFU. More, if you try to install iTunes with a version lower than the official version, iTunes prevent you. For example, you will not be able to pass the version of firmware 3.0 to 2.2.1 without doing it in DFU mode.

Mode récupération (Recovery mode) :

The recovery mode is a state that iBoot on standby in preparation for an upgrade of firmware (Firmware) or restore. Lorsqu'iBoot is active, it does not change the firmware to a version lower than that currently installed on the device. IBoot is to be mastered in order to flash the firmware.

To access the recovery mode, just :

1. Turn off the iPad, iPhone or iPod touch
2. Press the Home
3. Simultaneously press Home and connect to a computer or dock
3. Keep the Home button pressed until you see the iTunes logo appear : you are in recovery mode !

To exit recovery mode, just turn off the iPod, iPad or iPhone by pressing for 10 Home seconds and Power.

Display on the iPhone recovery mode

DFU mode (Device Firmware Update) :

DFU mode is a special mode where the iPhone, iPad or iPod touch can still communicate with iTunes, but without loading iBoot. The screen is completely black, so that while everyone might believe that the power is off. As iBoot is not loaded, and the system is exploitable IOS is not launched, This enables the injection of any created by a firmware jailbreak tool (sometimes called Pwnage tool, Tool Masters).

To access the DFU mode :

1. Connect your iPhone to computer cutter
2.Turn off the iPod, iPhone and iPad
3. Press Home and Power simultaneously for exactly 10 second
4. Release power but keep pressed home until the beep ordindateur showing the USB connection
5. A few seconds later, iTunes detects your iPhone, iPod or iPad

If the iTunes logo appears you are in recovery and not DFU, you have to start !

iPhone a DFU mode

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