- 1). Launch the iTunes software on your computer.
- 2). Go to the "Help" menu and select "Check for Updates." This ensures you have the most recent iTunes version installed on your system. If iTunes is out of date, the program prompts you to install the most recent version. Agree to the prompts and follow the next few screens to install the iTunes update.
- 3). Connect your iPhone via its USB cable to your computer or laptop.
- 4). Go to the "Devices" panel on the left sidebar of iTunes, and select your iPhone. On the right pane, by default, the program loads the "Summary" tab. If it does not, click "Summary."
- 5). Click the "Check for Update" button. ITunes notifies you if a new version of the Apple iOS firmware is available for your iPhone. If you are upgrading from iOS 3 to iOS 4 on the iPhone 3GS or iPhone 4 models, you receive a prompt to upgrade.
- 6). Click the "Update" button. During the install process, do not disconnect the iPhone from the computer. If you do, this may severely damage the iPhone or operating system.
- 7). Wait for the iPhone to finish updating. During the process, you will see the iTunes logo or Apple logo with a progress bar. Once it returns to the normal iPhone home screen, it is safe to disconnect the device from your computer.
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