Re: Hard reset or clean reboot
DFU stands for: Device Firmware Upgrade.
DFU mode is a state that allows you to put your iPhone to interface with iTunes, but does not load iOS operating system or boot loader. Thatís the main difference between DFU mode and recovery mode.
What is DFU mode used for?
DFU mode can be used for multiple things including upgrading firmware, downgrading firmware, and even rebooting your tethered jailbroken device. So, hereís a step by step tutorial on how to do it.
How to enter DFU mode:
- Plug your device into your computer
- Turn off the device by holding the Sleep/Wake or Power button and swiping it off
- Hold the power button for 3 seconds
- Begin holding the Home button without releasing the Sleep/Power button for 10 seconds
- Release the power button and continue holding the home button until you get a popup from iTunes that your device is recognized as being in recovery mode.
Thatís it, youíre in DFU mode. If you get stuck in DFU mode and need to get out, just hold the power button and home button simultaneously until the Apple logo appears.
This process works for the iPhone, iPod, and iPad so no matter what iOS device youíre using
How to exit DFU mode:
If you want to exit DFU mode, hold down the Sleep/Wake or Power button and the Home button at the same time for at least ten seconds, until the Apple logo appears.
**HINT: IF you ever get stuck on the apple logo on a boot loop because you have installed an app or tweak that is incompatible, you can bypass this loop and go into Safe Mode and remove the app or tweak that's causing the problem by holding up the "volume up" button during start up. Keep holding it up after you initially power it on and keep holding until you see the lock screen. NOTE: This works only for Jailboken phones. Those with apple approved phones and are still limited to what they can do, look, and paying for apps, then you're out of luck. One of many tricks to prevent a full out restore. Take that Apple.
Hope this answers your question.