Jailbreak upgrade help
I have an iPhone 4 currently jailbroken on 4.1 with a baseband of 02.10.04. I would like to unlock the phone so I can use it with a disposable micro sim in Europe next week. I have read that unlocking 4.1 at 02.10.04 is not possible. I was attempting to upgrade to 4.3.3, but following various online instructions using redsn0w and pawnage tool I have been unsuccessful. Once in iTunes it backs up and then gives me an error saying that it cannot be upgraded to the chosen firmware (not the exact wording of the error message).
Any suggestions on what to do? Is it still possible to upgrade from 4.1 to 4.3.3, jailbreak and unlock? Any thoughts if I missed something? Thanks in advance.