if u want GPS... u need at least spl 2.4 radio 3.24.30 and on vzw i would suggest the mixture of Shadowtech's guide and gc14's. I composed a guide mixing shadow-tech's instructs and the vzw info on hofo... but u need to unlock w/ 2.4 which is really easy once downloaded and upload to a new radio AFTER the unlock. Sometime when u upgrade the unlocker it gets stuck at the bootloader screen (3 color bars) dont worry, just put in ur radio rom... instal that, if its still a problem, put in DCD's rom (3.2.6) and install that and it will work fine. Then ur phone is unlocked and if u want GPS follow in the instructs in this guide if ur on VZW
http://howardforums.com/showthread.php?t=1427124