When confronted by a broken or unresponsive iPhone you will be required to use it into DFU Mode. Don't worry - it's actually not difficult. In this tutorial we'll provide you with how to put an iPhone into DFU mode, and explain briefly why you'd want to.
What is DFU mode?
DFU, short for Device Firmware Update, is usually a special mode that allows a computer to update its firmware. In DFU mode an iPhone can easily still communicate with iTunes but without iTunes automatically installing the modern version of iOS; it's therefore ideal for those running - or installing - older versions of iOS, along with jailbreaking. DFU mode will also be useful when seeking to rescue a non-responsive device it doesn't respond to other less drastic solutions.
(DFU is slightly different to the better-known Recovery Mode, whereby an iPhone is reset to factory settings but with the modern version of iOS.)
You could possibly be wondering what firmware is. As the name suggests, it exists for a level between your hardware (that's your iPhone) as well as the software - the iOS operating-system. Firmware is software that sits within the hardware and is also used to provide various functions on the hardware level.
One function of firmware is usually to start up the iOS software once you power up an iPhone, which is the reason updating or restoring the firmware is one means to fix an entirely unresponsive phone. It's also familiar with check the hardware, and ensure that the correct software is working, and that's why you'll also want to use DFU mode if you want to jailbreak your iPhone (and run software not sanctioned by Apple).
How to place iPhone into DFU mode
Here's tips on how to put your iPhone into DFU mode. The timing is difficult, to need to check it out a couple of times prior to it right.
Attach your iPhone into a Mac or PC with all the bundled USB cable. It can be on or off - it matters not.
Open iTunes.
Press and hold both power and Home buttons with your iPhone for eight seconds. (If you've got an iPhone 7 or 7 Plus, you'll must use the volume down button as opposed to the Home button.) The 'Slide to Power Off' screen (above) should appear.
After eight seconds, forget about the power button but keep holding the Home button (or perhaps the volume down button) until iTunes says: "iTunes has detected an iPhone in recovery mode." Don't be put off with that working - iTunes says this for DFU mode and also recovery mode.
Now you can release the Home button (or volume down button).
If you have done this properly, the screen from the iPhone is going to be black now - that's how you'll be able to tell it other than recovery mode, which displays the 'Connect to iTunes' image on the watch's screen. Note that when the Apple logo appears, you have been holding around the two buttons for days, and you'll must start this process again.
iPhone in recovery mode
In iTunes, you must see the iPhone show up in Devices. Click it to discover a window saying iPhone Recovery Mode with all the message: "If that you are experiencing issues with your iPhone, you'll be able to restore its original settings by clicking Restore iPhone." Click Restore iPhone.
iTunes with iPhone in recovery mode
How to exit DFU mode around the iPhone
Exiting DFU Mode and here we are at normal mode is simple enough. Simply hold the two Home button as well as the Sleep/Wake button before the Apple logo appears.
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