At first,you must to back up iPhone or iPad Data before updating to iOS 9
1. Click on the computer end of itunes to start, let itunes kept at start of state.
2, connect the data cable, make Apple products connected to the computer via a data line.
3, iPhone next in the "white apple" picture of the situation, and hold the HOME button (below the middle of the circle button) and power button (usually switch button), remember that while holding down until the picture of the "white Apple "disappear (with the usual off as a full black screen).
4, after the HOME key while holding down the power button to shutdown with the state, release the power button (usually switch keys), [Note:! HOME button or press and hold] wait about 10 seconds, wait for itunes connection signal.
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5, after the connection itunes will display pictures shown above, that your iPhone has been successfully connected to the computer!
Once successfully connected iPhone itunes, you can choose, the following two methods:
First, there is a user backup, you can see the button to restore the device directly in itunes inside, click on the recovery can be!
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