Example and Download iPhone iOS 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 and also follow some other handy guides (installing cracked apps, fixing different issues, etc) linked at the bottom.

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

Fix 16xx and 21 Error during iPhone 3.1.2 Restore in iTunes

• Update your iTunes to latest version.
• Try again..
• Also try killing iTunes process in Task manager and iPod services after the error occurs. Reopen iTunes and try again..
• Try changing the USB port the or on another system.
• read out http://support.apple.com/kb/TS1275

or
iPhone 3G, 2G and iPod Touch, iPod Touch 2G users can use iREB to get rid of this error:

1. Download iREB
2. Start iTunes and put your phone into DFU mode:
   

   How to Put iPhone in DFU Mode

3. Now close iTunes and Start iREB on your PC/Mac.
4. Run the iREB. Select your device and wait for a few seconds till you get white or a red screen on your iPhone.
5. Open iTunes. Now press and hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore”  button in the iTunes. Select a custom .ipsw file and restore it. Your 16xx errors are gone.

You can follow us to Twitter, Join our Facebook Fan Page, and also Subscribed to RSS Feed to receive latest updates on iPhone, iPod Touch and iPad.
You may also be interested in:

• How to: Install cracked apps on iPhone/iPod Touch
• How to: Fix Push Notifications
• How to: Fix iPhone Stuck at Apple Boot Logo
• How to: Fix recovery mode loop

Update 1: Download iPhone OS 3.1.3 Custom firmware