how to unlock iphone 3gs (4.1-4.2) bb 5.14.02 >>> bb 6.15.00

1) Download the newest redsn0w http://sites.google.com/a/iphone-dev...edirects=0&d=1 [At the moment, this is a beta version, but it works]
2) Download your CURRENT firmware (which should be around 4.1-4.2.1):
if your firmware is 4.1 download 4.1 if you are 4.2 take 4.2
iPod, iPhone and iPad Firmware Download
3) Browse redsn0w to your firmware you just downloaded.
4) Follow the instructions on redsn0w
5) Check “Install Cydia” and “Install iPad Baseband”
6) Once finished with redsn0w, open Cydia, search for ultrasn0w
7) Install it with your SIM card inserted, then reboot!
remember insert your sim before unlock using ultrasnow