Before you attempt an update, you may want to double check that your i OS device is compatible.
Older devices may not be able to get the latest and greatest, as their hardware cannot support certain features.
If i Tunes tells you that the version you have now is the current version, there is no other way around this.i Phone 5, i Phone 5S, i Phone 5C, i Phone 6, i Phone 6 Plus, i Phone 6S, i Phone 6S Plus, i Phone 7, i Phone 7 Plus, i Pod touch (6th generation), i Pad (4th generation), i Pad Air, i Pad Air 2, i Pad mini 2 and later, i Pad Pro If you have an i Phone 3GS or a 3rd generation i Pod touch, and i Tunes says that i OS 4.2.1 is the latest, then you actually have an i Phone 3G or a 2nd generation i Pod touch.
Updating first generation units
There is no 8GB model of the 3rd generation i Pod touch, so if yours is 8GB, it's probably a 2nd generation.
If there is an update available for your device, you can only download the latest version available.
For example, if i OS 4.2.1 is the latest for your device, you cannot update to 4.0, only 4.2.1.
If you have concerns about the latest update, for example, bugs in the software, do not worry.
Apple software updates are thoroughly tested, and in fact, most actually fix bugs.
Apple encourages you to stay up to date to get bug fixes and new features.
Those who say they are experiencing bugs will usually find they are not related to the update, and you can mostly find such concerns in technical support forums.
Keep in mind that not that many people come to a tech support forum to share good experiences, and only post if they are experiencing problems.
There have hardly been any bugs that have affected more than 1% of users.