hi Guys
recently i switched back to my iphone from BB. My phone still has the original 1.01 firmware, unlocked with Iphonesimfree. what is the easiest way to upgrade the phone to the most recent firmware ( and unlocked of course).

can i just do it through ziphone? or i have to do the whole 9 yard, upgrade to 1.1 jailbreak unlock then 1.2, 1.3 etc?