Hi! My dad just gave me an old iPad of his from work and I want to update it but am having trouble. It is an iPad2 2nd generation but it hasn't been used/updated in at least a couple of years (running iOS 4.3.5 currently). I want to update the software, but not all the way to iOS 8. Is there a way to update it to iOS 6 or 7? Any help/advice is appreciated - thanks so much!