Upgrade iPad 2 from 4.3.5

Hi, Can I upgrade iPad 2 from 4.3.5 to any firmware except iOS 6? I do not have any shsh saved - apart from these for iOS 6 - since I bought the devise 1 week ago. If the answer is no, which I suppose it is, I wonder if I had saved previous shsh from lets say TinyUmbrella, would I have the opportunity to upgrade (obviously not to iOS 6) and then jailbreak? I apologise for my silly questions but after reading all that stuff from several website, I got really confused thank you for your time and help regards,