To enter DFU mode, plug your iPhone in any power outlet or computer USB port. Then hold the power button. After three seconds, start holding the home button, too. Keep both buttons pressed for 10 seconds, then release the power button while continuing to hold the home button for another ten to fifteen seconds.
http://m.youtube.com/watch?v=ujhBn9v3zOo
To power the phone back on, hold the the power button and home button together until the Apple logo appears.
An easier way of entering complete shutdown, says Wang, is a straightforward hardware power-off—simply hold the home and power buttons simultaneously for 10 seconds without the DFU button sequence. “If the phone is in such a low-level state, I don’t see how it’s possible for anything to interact with the baseband,” he says.
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