That said, however, it is always important to do a backup of all the data on the device before upgrading.When you plug your device in, open i Tunes, and select the backup option, it should backup all the data that is on your device, including any music that is not in your current library.
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Same models use the same IPSW, different models need different IPSW.
To do this, you will need to download the i OS firmware files directly from Apple.
To install the i Tunes upgrade, follow these steps: On a Windows PC: i Tunes launches your Web browser and takes you right to the i Tunes download page.