Download PwnageTool 4.1.3 Unlock Edition
PwnageTool 4.1.3 unlock edition has been released by the iPhone Dev Team. This version of PwnageTool lets you create a custom firmware for iOS 4.2.1 and iOS 4.1 with 06.15.00 baseband taken from iPad 3.2.2 firmware. iPhone 3GS and iPhone 3G users who want to unlock their device on baseband 05.14.02 or higher need to first update their baseband to 06.15.00 using PwnageTool 4.1.3.
Confusing? Well let us try to explain a bit further before going ahead with the tutorial. Sherif Hashim, the iPhone hacker has discovered a crash in the AT+XAPP command on iPad 3.2.2 which has a baseband 06.15.00. This bb version is higher than the current unlockable baseband 05.14.02 of iPhone 3GS & 3G. So you upgrade your baseband first to 06.15.00 (which is possible) and then unlock it on this higher baseband.
Here is a guide to update your iPhone 3GS or 3G to baseband 06.15.00 using PwnageTool 4.1.3.
Update iPhone 3GS, 3G Baseband to 06.15.00 Using PwnageTool 4.1.3
After updating your iPhone 3GS/3G baseband from 05.14.00 to 06.15.00 go ahead and unlock it:
Unlock iPhone 3GS, 3G Using Ultrasn0w 1.2
PwnageTool works only for Mac OS X. Windows users will have to wait for an update to Redsn0w.