How to put iPhone/iPod Touch into DFU/Recovery mode

DFU - means Device Firmware Update. If a restore using Recovery Mode doesn't work you will want to use DFU Mode as a last resort. When placing your iPhone into DFU Mode it does not load the OS before attempting the restore


DFU
-Run iTunes and connect (plug in) your iDevice



-Press and hold the Home button and the Sleep/Wake button at the same time.



-After exactly 10 seconds 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:






Recovery
-Open iTunes and connect the iPhone to your Mac.



-Press and hold the Home button and the Sleep/Wake button at the same time.



-As soon as the screen goes black 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 will look like this:


Credit to wo_Ot?