How to Put an iPhone Into DFU Mode

How to put an iPhone into DFU Mode

1. Open iTunes and connect your phone to system.
2. Press and Hold Home and Sleep/Wake Button at the same time.
3. Hold the buttons for 10 Seconds and then release only the Sleep/Wake button keep hold Home button till the pop up message appear on the system screen.
   
4. The phone screen will remain black for few seconds.