HT2305: Using Software Update for Windows to keep your Apple software up-to-dateLearn about Using Software Update for Windows to keep your Apple software up-to-date
Currently Being ModeratedApr 12, 2013 8:33 AM (in response to Joan3771)
Update it from iTunes on a computer as described at the bottom of this article. As it's running an iOS version prior to 5.0, there won't be an option to update from the device itself.
Currently Being ModeratedApr 12, 2013 9:39 AM (in response to Niel)
If the poster wants to update to iOS 5 and no further then this can't be done on an iPad 2 (if that's what the poster actually has).
An iPad 2 (or later) can only be updated to iOS 6.1.3 following the procedure that Niel posted.
An iPad 1 can be updated to iOS 5.1.1.