Ultrasn0w fixer for.2 has been released to make ultrasn0w 1.2.1 work with .2 to and with old basebands.
Take a serious look below and find your basebands
01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00
Unsupported basebands :
02.10.04 / 03.10.01 / 04.10.01 / 05.14.02 / 05.15.04 / 05.16.02
You have to your on 6.15.00 basebands on 4.1 / 4.2.1, you can follow for or guide for Windows / (You may lose your GPS)
Take step by step to unlocking below…
Step 1: Now you have to jailbreak your or iPhone 3GS on the latest iOS 4.3.2, you can follow this guide (Untethered with Sn0wbreeze 2.6 for Windows) or this guide (Tethered with for Mac)
Step 2: Open on your iPhone 4 or 3GS
Step 3: Go to Manage->Sources
Step 4: Now tap on “Edit”, then tap on “Add” and Enter the following repo http://djayb6.com
Step 5: Now tap on “Add Source” then tap on Done.
Step 6: Search for “ultrasn0w fixer for 4.3.2” inand install this application. This app will automatically your iPhone so that you can use it with any carrier.
Step 7: Now simply restart your iPhone and you should now have a fully unlocked iPhone 4 or 3GS, running iOS 4.3.2.