How to download iOS 6.1.3
How to download iOS 6.1.3 on ipad 2
iPad 2, iOS 4.3.1
How to download iOS 6.1.3 on ipad 2
iPad 2, iOS 4.3.1
If you are using IOS 4, you need to connect to iTune (computer) to update software.
Update it from iTunes on a computer as described at the bottom of this article; devices running an iOS version prior to 5.0 can't be updated straight from the device. Unless limited by the device's hardware, it will be updated to iOS 6.1.3.
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Make sure all contents are transferred and device is backed up before you update.
Transfer purchases
http://support.apple.com/kb/HT1848
How to backup
You have iOS 4... See Here...
http://support.apple.com/kb/HT4972
OR...
Connect to iTunes on the computer you usually Sync with and “ Check for Updates “...
See the Using iTunes Section Here...
How to download iOS 6.1.3