DFU is stand for Device Firmware Update.
This tutorial will guide you how to put iPhone into DFU mode.
Please read these steps carefully before you decide to do it.
1. Open iTunes.
2. Connect the iPhone using its USB cable.
3. Press and hold down the Home and Sleep/Wake button on your iPhone together.
4. Your iPhone will be restarted and when the Apple logo appear on your iPhone, release the Sleep/Wake button immediately, but do not release the home button.
5. A popup message will appear that saying:
iTunes has detected an iPhone in recovery mode. You
must restore this iPhone before it can be used with
iTunes.
6. Then, you can release the Home button.
You will see this on your iPhone screen:
Now, you can Update iPhone software with shift and restore.
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