OS 3.1.2 jailbreak

I am getting some complaints about how to downgrading and jailbreaking iphone 3g/3gs to OS 3.1.2, so here is a few minutes process. I bet it is the easiest of the processes. ;-)
HERE WE GO ::

"The current update of Blackra1n only supports iPhone OS 3.1.2, do not use this tool if you are using an earlier version of iPhone OS".
1. Download the Black ra1n jailbreak software for iPhone OS 3.1.2 from http://www.blackra1n.com

2. Put your phone in recovery mode.

3. Download firmware 3.1.2 from links below:
Download iPhone OS 3.1.2 for iPhone 2G iPhone 3G: iPhone1, 2_3.1.2_7D11_Restore.ipsw
iPhone 3GS: iPhone2, 1_3.1.2_7D11_Restore.ipsw
iPod Touch 1G: iPod1, 1_3.1.2_7D11_Restore.ipsw
iPod Touch 2G: iPod2, 1_3.1.2_7D11_Restore.ipsw
iPod Touch 3G: iPod3, 1_3.1.2_7D11_Restore.ipsw

4. Open itunes it will say that itunes has detected iphone in recovery mode.

5. Then by pressing SHIFT button click on restore.

6. Browse and open the file you downloaded.

7. Now when itunes has finished extracting software open rain.

8. Now click on "MAKE IT RAIN".

9. Your iPhone will restart and jailbroken.

10. Just open blaickra1n in your iDevice and install CYDIA.

11. For UNLOCK install SNOW from Blackra1n icon.

Now you are jailbroken.

ENJOY !!! :-)