In the computer we install the latest version of the "itunes" software, this can be to the official or Baidu search download:
1. Open itunes on your computer, connect your phone to your computer, and then turn off the iphone.
(Make sure to connect first, then shut down the machine)
2. Now we hold the power-on key with our hands and then press the home button when the Apple icon appears (the key in the following circle) until the Apple logo disappears.
3. Now we then press and hold the Power-on key slackened and the home keyboard continues to press until the computer appears DFU mode connection. itunes recovery prompt
4. Now you can click on the "restore the iphone" immediately restore the phone, the iOS file we can download first in the local, can also be directly online upgrades can be.
After the recovery we can directly boot up and do not need a password, of course, if not your iphone set up to find My iphone features you can not brush the machine only if you cancel this feature you will be able to set up.