I bought a refurbished iPad2 from apple. It wouldn't download an app that requires iOS5, so I checked my iPad version and it is 4.3.5 (8L1).
There is no option to upgrade it under Settings>General. Nor is there an obvious option when I connect it to the computer.
On Itunes>Summary it offers me to Update but that only updates to the iTunes latest version (10.6.1), not the iPad iOS.
Any bright ideas out there? Or have I just been ripped off by apple?