DFU or Device Firmware Upgrade allows your iPhone to be restored at any state. This may be useful when you want to achieve a deep restore even even by selecting a locally stored file. You might need to put your iPhone in DFU mode where there are issues with the operating system.
To put your iPhone (iPad, iPod Touch) in DFU mode:
- Turn off your iPhone
- Connect your iPhone to your computer with the USB cable
- Press the Sleep/Wake button for 3 seconds
- Without releasing, press the Home button and keep both of them pressed for 10 seconds.
- Release he Sleep/Wake button and keep pressing the Home button for another 15 seconds.
To exit DFU mode from your iPhone you need to force restart the device.
This is A quick tip and we will be referring to this post every time a DFU mode is needed to save time time so we don’t need to explain every time what DFU is and how to do it.