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Message: <blockquote data-quote="KushG" data-source="post: 2559033" data-attributes="member: 542620">Using 3gs on firmware 3.1.3 and Baseband 5.12 (New bootrom) JB by spirit n Unlocked by Ultrasnow. I wish to upgrade to 4.x os. Can someone please tell me 1)Will i lose all data and apps 2) will I have to upgrade from I tunes then JB it? (Just like a New Restore) 3) Can i Use pwnage tool or some other to upgrade n JB at the same time 4) Which SW to use for JB and Unlock and which os to select 4.0, or 4.1 or 4.2 or 4.3(I will need an Unlock) 5)Will firmware upgrade also change BB version?</blockquote>