Hi! i learned that most of the new games and apps will require 4.0 to run on iphone! i Have a 3G 3.1.3 and i would like to know if theres a way to upgrade to 4.0 wihout removing the jailbreak and without losing what stuff i have already instaled like skins themes etc. i dont remember what method my friend used to jailbreak my phone so that might complicate things. thanks in advance!