1. Plug iPhone to your computer.2. Make sure to turn on the volume of your speaker as you will this as guide to hear the beeps.
3. Hold the Sleep and Home buttons simultaneously for 10 seconds
4. When you hear the first beep, immediately release the sleep button while still holding on to home.
5. Wait for the second beep then release the home button
6. The screen on your phone should now be black and you have successfully entered DFU Mode.
A simple tip to enter DFU mode. By the way, it's a good idea to recover deleted data in the DFU mode.
TumugonBurahin