upgrade ipad to from ios 4.3.3 to ios 9.1
I just bought a new (still in the box) iPad 2. It came with iOS 4.3.3. When I try to sync it with my computer I get a error 9. I've read everything I can find on error 9, and tried every trick. Finally downloaded Reiboot to get it out of the Recovery cycle loop. I suspect I need to do a number of upgrades (perhaps even firmware) that were associated with upgrades to iOS 5, 6, 7 and 8. Anyone have a solution?
iPad 2, iOS 4.3.3, Brand new