3GS: In this method, even if you're stuck on 05.15.04(unlockable), we can upgrade to the iPad BB, 06.15.00, and downgrade again past 05.15.04 to 05.13.04, so that you can have an unlock, and preserve your GPS!
3G: If you have accidentally upgraded to 05.15.04, you can use this method. You can also upgrade to the latest 4.2.1 iOS using a custom IPSW, so that you don't upgrade your baseband, then upgrade to iPad BB and downgrade again to 05.13.04. Make sure you don't upgrade using an apple IPSW, it could upgrade your baseband to something you don't want. I don't show you how to make a NO_BB file, pwn DFU, then restore with it, but it's quite easy, refer to link below for that.
WARNING: CHECK YOUR MANUFACTURE DATE, IF IT'S NEWER THAN WEEK 28 OF YEAR 2011, DO NOT PROCEED. EVEN IF IT IS OLDER THAN THAT DATE, YOU COULD STILL RISK BRICKING YOUR PHONE!! DO THESE STEPS AT YOUR OWN RISK, THEY CAN BRICK YOUR PHONE IF SOMETHING GOES WRONG DURING THE BASEBAND UPDATE.
This method of unlocking your 3G and 3GS requires that you have not updated to iOS6 and updated your baseband to 3.00.00. If you have done that, you cannot downgrade the baseband. If you have saved your SHSH Blobs, you can downgrade your iOS, but your baseband is stuck for good.
RESOURCES:
iOS6 Ultrasn0w Fixer: Install Fixer FIRST, then install ultrasn0w, you must do it in that order to get your iOS6 working with Ultrasn0w! (Not the other way, as the instructions say)
http://www.letsunlockiphone.com/unlock-ios-6-ultrasn0w-fixer-iphone-4-3gs/
Download Redsn0W: OLD VERSION:://sites.google.com/a/iphone-dev.com/files/home/redsn0w_win_0.9.14b2.zip
NOTE: Download the newest Redsn0w, 0.9.15b2:
https://sites.google.com/a/iphone-dev.com/files/home/redsn0w_win_0.9.15b2.zip...
Download 4.2.1 iOS for 3G:
http://www.iclarified.com/entry/index.php?enid=750
File Name: 4.2.1 (3G): iPhone1,2_4.2.1_8C148_Restore.ipsw
Tinyumbrella: http://www.ijailbreak.com/how-to/how-to-save-your-shsh-blobs-with-tinyumbrell...
iOS6 downgrade: http://insanelyi.com/topic/11750-how-to-downgrade-from-ios-6-to-ios-5/
Custom IPSW file, NO_BB upgrade: http://www.mygsmforum.com/f5/learn-how-create-custom-firmware-ipsw-redsn0w-9785/
COMPILATION OF ALL SOFTWARE DOWNLOADS:
http://www.ijailbreak.com/ijailbreak-downloads-section/
YOU CAN CHECK THE VIDEO TUTORIAL HERE:
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