Download iPhone OS 3.1.2 Custom Firmware (IPSW Files) for iPhone 3GS, 3G, 2G

You can jailbreak iPhone OS 3.1.2 by creating Custom IPSW file using PwnageTool. For now, PwnageTool is available for Mac only. So, only Mac users are able to create custom firmwares. What if you’re on Windows? and do not own a Mac or don’t want to go through the PwnageTool procedure if so, this topic is for you.
Below you can download iPhone OS 3.1.2 Custom firmware for iPhone 3GS, iPhone 3G and iPhone 2G. These custom firmwares are created with PwnageTool and can be restored using iTunes.

IMPORTANT
There are two types of Custom Firmwares available for download below.

1. ACTIVATED: This custom IPSW file is for users who want to unlock their iPhone which means they are NOT on Official Carrier only.
2. NOT ACTIVATED: This custom IPSW file is for users who are on Official Carrier only.

So make your choice wisely. You’ll know whether you made the right choice or not once you successfully get the Signals or could Not.

How to Install Custom Firmware:

1. Download the custom firmware (IPSW) (all parts) for your device from links below.
2. Join the splitted custom IPSW file by unpacking them:
   
   • Mac Users: use BetterZip ( or what ever you want )
   • Windows Users: use HJSplit ( or what ever you want)
   
   
3. Put iPhone in recovery mode. (How to put iPhone into Recovery Mode)
4. Press the Shift button for Windows or ALT for Mac and click restore and used the custom ipsw.
5. It will start restoring your iPhone which may take 10mins and will jailbreak iPhone. (iPhone 2G users are done here >Jailbreak+Unlock<. enjoy OS 3.1.2.)
6. iPhone 3GS and 3G users who want to unlock iPhone needs to install UltraSn0w using following guide:
   
   

   How to Unlock iPhone 3GS and 3G using UltraSn0w (This works for OS 3.1.2 as well)
   

   
   

Once all done successfully, you can enable Tethering hack on OS 3.1.2.

Download iPhone OS 3.1.2 Custom Firmware (IPSW Files):

iPhone 3GS Custom IPSW

Activated (for UnOfficial Carrier Users)

RAPIDSHARE:
iPhone2_1_3.1.2_7D11_Custom_Restore_Activated.001
iPhone2_1_3.1.2_7D11_Custom_Restore_Activated.002
iPhone2_1_3.1.2_7D11_Custom_Restore_Activated.003
iPhone2_1_3.1.2_7D11_Custom_Restore_Activated.004
MEGAUPLOAD:
iPhone2_1_3.1.2_7D11_Custom_Restore_Activated.001
iPhone2_1_3.1.2_7D11_Custom_Restore_Activated.002
iPhone2_1_3.1.2_7D11_Custom_Restore_Activated.003
iPhone2_1_3.1.2_7D11_Custom_Restore_Activated.004

NOT Activated (for Official Carrier Users)

RAPIDSHARE:
iPhone2_1_3.1.2_7D11_Custom_Restore_NOT_Activated.001
iPhone2_1_3.1.2_7D11_Custom_Restore_NOT_Activated.002
iPhone2_1_3.1.2_7D11_Custom_Restore_NOT_Activated.003
iPhone2_1_3.1.2_7D11_Custom_Restore_NOT_Activated.004
MEGAUPLOAD:
iPhone2_1_3.1.2_7D11_Custom_Restore_NOT_Activated.001
iPhone2_1_3.1.2_7D11_Custom_Restore_NOT_Activated.002
iPhone2_1_3.1.2_7D11_Custom_Restore_NOT_Activated.003
iPhone2_1_3.1.2_7D11_Custom_Restore_NOT_Activated.004

iPhone 3G Custom IPSW

Activated (for UnOfficial Carrier Users)

RAPIDSHARE:
iPhone1_2_3.1.2_7D11_Custom_Restore-Activated.001
iPhone1_2_3.1.2_7D11_Custom_Restore-Activated.002
iPhone1_2_3.1.2_7D11_Custom_Restore-Activated.003
MEGAUPLOAD:
iPhone1_2_3.1.2_7D11_Custom_Restore-Activated.001
iPhone1_2_3.1.2_7D11_Custom_Restore-Activated.002
iPhone1_2_3.1.2_7D11_Custom_Restore-Activated.003

NOT Activated (for Official Carrier Users)

iPhone1_2_3.1.2_7D11_Custom_Restore_NOT_Activated.001
iPhone1_2_3.1.2_7D11_Custom_Restore_NOT_Activated.002
iPhone1_2_3.1.2_7D11_Custom_Restore_NOT_Activated.003

iPhone 2G Custom IPSW

Activated (for UnOfficial Carrier Users)

RAPIDSHARE:
iPhone1_1_3.1.2_7D11_Custom_Restore_Activated.001
iPhone1_1_3.1.2_7D11_Custom_Restore_Activated.002
iPhone1_1_3.1.2_7D11_Custom_Restore_Activated.003
MEGAUPLOAD:
iPhone1_1_3.1.2_7D11_Custom_Restore_Activated.001
iPhone1_1_3.1.2_7D11_Custom_Restore_Activated.002
iPhone1_1_3.1.2_7D11_Custom_Restore_Activated.003