Get out of DFU mode
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You will see nothing (or just white background) on the screen of your iPhone / iPod Touch if it is in DFU mode.
To get out of DFU mode take the following steps:

Hint Mind you, advice below is iPad mini / iPad 4 and iPad 3 / iPad 2 / iPad applicable.
  1. Start iTunes
  2. Connect iPhone / iPod Touch to Mac / PC via USB cable. (Look here how to connect properly)
  3. Simultaneously press and hold for 10 seconds both HOME and Sleep/Wake buttons.
  4. After 10 seconds release both buttons.
  5. Press shortly the Sleep/Wake button.
  6. Wait until your iPhone / iPod Touch will start up.

You may kick out of dfu mode not connecting iPhone / iPod Touch to Mac / PC. To do this simply press simultaneously both HOME and Sleep/Wake buttons and keep them holding until Apple logo appear on the screen.