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How to Put an iPhone Into DFU Mode

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How to Put an iPhone Into DFU Mode
 
DFU mode is a state that you can put your iPhone into where it can interface with iTunes but does not load the iPhone operating system or boot loader (this is what really differs DFU mode from recovery mode). DFU stands for Device Firmware Update. DFU mode is not recovery mode. Recovery mode has a picture that says connect to iTunes. In DFU mode, the iPhone screen backlight is not even on and the display is blank. If you have anything on your display you are not in DFU mode

WARNING:
This tutorial will show you how to put your device into DFU mode. Please try this at your own risk. Although there may be a resolution to almost all errors, please read the instructions carefully when downgrading so you won’t encounter any problems along the way.

DFU mode = Device Firmware Update mode

DFU mode is a mode where the iPod Touch/iPhone/iPad will be made to force a restore of the firmware into whatever version firmware it is given.

Getting into DFU mode is somewhat tricky, and it may require some patience/practice because timing is essential to get it to DFU mode and not into recovery mode.

1. First, Open up iTunes, plug in your iPod Touch/iPhone to the CPU's USB port. Turn on your CPU's speaker and make sure it is loud enough that you can hear it.

2. Hold down the Home button (top left for iPod Touch and top right for the iPhone with the screen facing you) and the Power button (located on the front bottom of your iPod Touch/iPhone) simutaneously, until the screen goes black and the device turns off. (past the red slider/slide to power off screen)

3. Now let go of the Power button, but continue to hold the Home button. Your iPod Touch/iPhone should have turned off and the screen should not be on.

4. After around ~10-20 seconds, you will hear a noise (beep/ding) from your CPU as if it had just recognized a new hardware device, now iTunes should recognize it in DFU mode.

5. After iTunes recognizes the iPod Touch/iPhone, let go of the Home button otherwise it will go into recovery mode and you will have to do the entire DFU process over again.

6. You will know when you have put your iPod Touch/iPhone correctly into DFU mode when the display is blank and that you do not have anything on your device.
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