Enter DFU mode on iPhone / iPod Touch / iPad
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If you sometimes find yourself needing a DFU mode on iPhone / iPod Touch / iPad do the following:

  1. Turn off iTunes
  2. Connect iOS device to Mac / PC via USB cable. (Look here how to connect properly)
  3. Power off iPhone / iPod Touch / iPad
  4. Wait for 30 seconds.
  5. Press and hold for 3 seconds Sleep/Wake button.
  6. After 3 seconds, keeping hold on Sleep/Wake press Home button for 10 seconds.
  7. After 10 (exactly) seconds, keeping hold on Home button release Sleep/Wake one, after that keep pressing Home for about 15 seconds more.(Screen should remain black, if you see anything but a blank screen, you got the timing wrong. By repeating above stepsyou must try again until you get it right )
  8. When “new device found” message appear on computer screen your iPhone / iPod Touch is in DFU mode.

Procced with advice on how to quit DFU mode