- 1). Launch iTunes on your computer.
- 2). Connect your iPhone to the computer via the USB cable.
- 3). Wait for iTunes to recognize the iPhone and launch the iPhone summary page.
- 4). Click on the "Sync" button in the lower right corner of the iTunes window. This will back up the data on your phone, so you still have access to it if something should go wrong with the operating system upgrade.
- 5). Click on the "Check for Update" button.
- 6). Choose the "Download and install" option. Be patient, as it may take several minutes. It is extremely important that you do not disconnect the iPhone from the computer or attempt to use it in any way during the installation of the upgrades.
- 7). Disconnect the iPhone from the computer and reboot the device to finalize the installation of the upgrades.
- 8). Plug the iPhone back into the computer if, after the upgrade, you lost any text messages, contacts or other data. When the iPhone summary page appears, click the "Sync" button to have the data restored.
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