I just bought an used iPad 1, version 3.2 IOS. It is now jailbroken but I would like to upgrade to ios 4 - ideally, 4.3.3. The latest upgrade from apple is 4.5. Is it possible to upgrade to a version that is not the latest? 4.3.4 only has a tethered jailbreak, and that won't work for me. Thanks for the help!