Recently i had posted about Blacksn0w a tool which would be the only alternative to unlock iPhone OS with 3.1.2 firmware with base band 05.11.07 unless you have a custom ipw firmware which would enable to unlock.Geohot has successfully confirmed its working with iPhone OS 3.1.2.

Blacksn0w will be  made available via Blackra1n RC3, In order to unlock iPhone 3G/3GS 3.1.2 you would first need to upgrade to firmware 3.1.2 and then download Blackra1n for windows/mac and click on make it ra1n. once your iPhone reboots you will see “blackra1n” app click on it You will see “sn0w”. Install this, and enjoy your unlocked iPhone.

This version of Blackra1n features

* Unlock and jailbreak for 3.1.2 firmware on 05.11.07 baseband
* Enabling official tethering on the iPhone.
* Hacktivation [Auto Activation] support.
* 15 seconds speed improvement.
* Tiger+PPC support

Note:This would be only for iPhone 3G/3GS users only.

What you need:

• Download iTunes 9.0/iTunes 9.0.2
• Download iPhone 3.1.2 firmware for iPhone 3G
• Download iPhone 3.1.2 firmware for iPhone 3GS
• Download Blackra1n RC3

Important Note : For those who have already installed blackra1n RC1 or RC2 should directly run the the Blackra1n.app and click on “ra1n” (ra1n replaces “Icy”).  This will automatically upgrade blackra1n to RC3. Now simply follow Step 3.

Step 1: Open iTunes, connect iPhone and Update/restore to the original iPhone firmware 3.1.2.

Step 2 : You will now have to jailbreak your iPhone running on iPhone 3.1.2 firmware with blackra1n RC3. This procedure is same as earlier, and you can follow the guide: Jailbreak iPhone 3.1.2 Firmware using BlackRa1n.

Step 3: [When jailbreak completes] Open the blackra1n.app and you should now see “sn0w”.

Step 4: Touch on “sn0w” to install blacksn0w. Blacksn0w is now also available on Cydia: add http://blackra1n.com/ to cydia Sources.Cydia will now automatically update your sources by following a series of automated steps.

Step 5: After installation is completed. Search for “blacksn0w” in Cydia and install blacksn0w.Now simply restart your iPhone.This will Unlock your iPhone 3G, 3GS running 3.1.2 firmware on 05.11.07 baseband.

If you encounter issues with WiFi after unlocking with blacksn0w then you should try and reset your network settings by navigating to Settings –> General –> Reset –> Reset Network Settings and then reboot the iPhone.If this also didn’t work then refer RedmondPie’s post on fix blacksn0w WiFi Youtube GPS Problem running on iPhone 3.1.2 Firmware.If you fear you have a virus attack and need help in fixing it then do take a interesting read.

The author/Admin is a Software engineer and currently pursuing his MBA.His interests include blogging anything about technology,music dance and bike racing.