You can use iTunes to update or restore iPhone or iPod touch software. Apple recommends updating iPhone or iPod touch to use the latest software. You can also restore the software, which puts iPhone or iPod touch back to its factory condition.
If you choose to update, the iPhone or iPod touch software is updated but your settings and media are not affected.
If you choose to restore, all data is erased from iPhone or iPod touch, including songs, videos, contacts, photos, calendar information, and any other data. All iPhone or iPod touch settings are restored to their
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