I just dug out my old iPhone 3G which was jailbroken some years ago and currently has the version 2.2(5G77) - please don't judge me, I know this is old. I need to get this phone back into action for a temporary measure as I am moving and have to give up my iPhone 4. Can I update the version? Is there is a chance I might brick the phone? How do I update a jailbroken phone(I think it is jailbroken - it has cydia on it)?