DFU = Device Firmware Update. Only use DFU mode as a last resort, if a restore using Recovery Mode doesn't work . When you enter your iPhone into DFU Mode it does not load the OS before attempting the restore therefore it is able to Unbrick your Bricked iPhone
(it will work 90% of the time).
Step 1 
Open iTunes and connect the iPhone to your PC or Mac.
Step 2 
Press and hold the Home button and the Sleep/Wake button at the same time.
Step 3 
After exactly 10 seconds
(Count 1 thousand 2 thousand 3 thousand 4 thousand........) release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
The iPhone screen will remain black like this:

If anything else like this:

Try again ! Make sure get your timing right.
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