Hard resetting the iPhone 4S with iTunes
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1.Switch the iPhone off.
2.Insert the USB cable, then hold the Home key while connecting the iPhone to iTunes.
3.On the computer, when prompted that iTunes has detected the iPhone in recovery mode, click OK.
4.Click Restore iPhone…
5.Click Restore and Update.
6.iTunes will begin to restore your iPhone.
7.Restore has completed successfully.
After restoring your Apple iPhone 4, you may need to reactivate the SIM card using iTunes.
Important: A hard reset will delete your data, apps and settings.
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