The popular iPhone hacker Geohot has finally released the much awaited blackra1n RC3 with blacksn0w which unlocks both iPhone 3G and iPhone 3GS running on iPhone 3.1.2 firmware with 05.11.07 baseband (aka modem firmware). This latest version of blackra1n includes unlock and jailbreak for 3.1.2 firmware on 05.11.07 baseband, option for enabling native Internet Tethering on the iPhone, hacktivation support, 15 seconds speed improvement and support for OS X Tiger & PPC (PowerPC) Macs. However it is to be noted that blacksn0w is for iPhone 3G and 3GS users only. Those of you with iPhone 2G should follow the guide posted here or here for unlocking and jailbreaking 3.1.2 firmware. Here is a complete step by step guide on how to unlock iPhone 3G and 3GS running 3.1.2 firmware on 05.11.07 baseband with blacksn0w.

blackra1n RC3 is by far the fastest and the most complete jailbreaking and unlocking tool for iPhone running on the latest iPhone 3.1.2 firmware. The latest RC3 version includes blacksn0w which can unlock iPhone 3G and iPhone 3GS running 05.11.07 baseband. When iPhone 3.1.x firmware was released, Apple patched the exploit that allowed iPhone users to unlock iPhone’s. As a result, many users who upgraded to the latest firmware were left locked out with 05.11.07 baseband until geohot came to the rescue. Follow the simple step-by-step guide below to jailbreak all iPhone’s (2G/3G/3GS) and iPod touches (1G/2G/3G) on firmware 3.1.2.