1, we want to enter into the DFU mode, we can first put your iphone off.
2, then we also hold down the power (shutdown) key and the home key and then into the boot state.
3, when the iphone screen appears white Apple logo, loosen the power button, but the home button or hold on.
4, open itunes, see prompted to restore when we hold down SHIFT and then click "Restore", select the appropriate firmware to recover.
How to exit DFU mode
In fact, let the iphone exit DFU mode is very simple, the forward DFU mode should be connected to the data line, at this time you only need to hold down the "home" and "power" keys do not let go, and then maintain about 10 seconds.
If you hear a "buzz" on your computer or see a white Apple logo on the iphone, release the "Home" key and the "power" button. Then do not press any buttons, the iphone will automatically boot. The iphone screen will show the Apple logo for a long time will not move, you need to do is to relax, wait, wait, wait.
Alternatively, you can exit DFU mode using a Third-party tool. Third-party tools can be used TinyUmbrella inside the "Exit Recovery". Link the iphone to the computer, then open TinyUmbrella, click the "Exit Recovery" above.
Well, it used to be a small part of the introduction of the iphone to enter and exit the DFU mode of the method, in fact, very simple is to press a few buttons, but we need to pay attention to the key to a step.
