Hi, I gave up waiting for dev-team unlock on 5.14 bb and decided to unlock using bb 06.15.00. I spent 3 days looking for 4.2.1 jailbreak & unlock and still confused. I have two laptop (xp and vista 64) and att sim card. 3G: It is old bootrom and unlocked on 3.1.3. I want to unlock and jailbreak on 4.2.1 - I need snowbreeze and iOS 4.2.1 to build a custom ipsw right?? 3GS: It is new bootrom and jailbreak & locked 4.1. I want to unlock and jailbreak on 4.2.1. I have no clue for this one. Thanks.