Hello. For the past couple of days I'm trying to unlock my iphone 3gs. I'm currently running iOS 6.0.1 which was jailbroken via Sn0wbreeze custom firmware(following http://www.beijingiphonerepair.com/...one-4-or-3gs-with-sn0wbreeze-custom-firmware/). My baseband is 06.15.00 and ultrasn0w + ultrasn0w 6 fixer doesn't work. I have read that I need to downgrade my baseband to 05.13.04. Can I use redsn0w 0.9.15b3 to downgrade baseband version to 05.13.04 even though I used Sn0wbreeze and not redsn0w for jailbreaking? If I can, what is the correct procedure? I would appericiate any help as I have spent more than 10 hours trying to unlock this phone. Thanks a lot.