Update
uupdate
iPad 2 Wi-Fi, iOS 9.0.2
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See the chart below to determine whether you can upgrade your device and what you can upgrade to. If you do not have a Software Update option present on your iDevice, then you are trying to upgrade to iOS 5 or higher. You will have to connect your device to your computer and open iTunes in order to upgrade.
IPhone, iPod Touch, and iPad iOS Compatibility Chart
Device iOS Verson
iPhone 1 iOS 3.1.3
iPhone 3G iOS 4.2.1
iPhone 3GS iOS 6.1.x
iPhone 4 iOS 7.1.x
iPhone 4S iOS 9.x.x
iPhone 5 iOS 9.x.x
iPhone 5c iOS 9.x.x
iPhone 5s iOS 9.x.x
iPhone 6 iOS 9.x.x
iPhone 6 Plus iOS 9.x.x
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iPod Touch 1 iOS 3.1.3
iPod Touch 2 iOS 4.2.1
iPod Touch 3 iOS 5.1.1
iPod Touch 4 iOS 6.1.x
iPod Touch 5 iOS 9.x.x
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iPad 1 iOS 5.1.1
iPad 2 iOS 9.x.x
iPad 3 iOS 9.x.x
iPad 4 iOS 9.x.x
iPad Mini & Mini Retina iOS 9.x.x
iPad Air iOS 9.x.x
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Select the method most appropriate for your situation.
Upgrading iOS
1. How to update your iPhone, iPad, or iPod Touch
4. iPad Support
a. Updating Your iOS from iOS 5
Tap Settings > General > Software Update
If an update is available there will be an active Update button. If you are current,
then you will see a gray screen with a message saying your are up to date.
b. If you are still using iOS 4 — Updating your device to iOS 5 or later.
c. Resolving update problems