An IPSW file is a type of firmware file used by iPhones. By installing a new IPSW file onto your iPhone 3G, you can update the firmware and operating system on your device. By design, your iPhone syncs with the iTunes application on your computer, and you can use this sync process to install new IPSW firmware files on your iPhone.
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Download the IPSW firmware file you want to install on your iPhone 3G. You can find links to the current and previous IPSW files in the Resources section of this article.
Open the iTunes program on your computer.
Attach the data cable to the bottom of your iPhone and connect the other end of the data cable to a USB port on your computer.
Select your iPhone from the "Devices" field in iTunes.
Press the "Control" and "Shift" keys on your computer. While continuing the press these buttons, click the "Restore" button in iTunes. Release the buttons.
Select the IPSW firmware file you downloaded.
Wait while iTunes syncs with your iPhone and installs the IPSW file. iTunes will prompt you when the process is complete.
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