Jailbreak iPhone 4, 3GS iOS 4.3.1 Using Sn0wbreeze

Sn0wbreeze 2.4b1 has been released to jailbreak the recently released iOS 4.3.1 on iPhone 4, iPhone 3GS (old and new bootrom), iPad, and iPod Touch 4G, 3G. This jailbreak is tethered, meaning which you will have to use the included iBooty utility to ‘boot into tethered mode’ each time you reboot your iPhone 4 or iPhone 3GS (new bootrom). Only iPhone 3GS old bootrom users will have an untethered jailbreak.

Sn0wbreeze is a Windows only tool. Mac OS X users can jailbreak iOS 4.3.1 on iPhone 4, 3GS using the unofficial PwnageTool Bundles along with PwnageTool 4.2.
Similar to PwnageTool, Sn0wbreeze also lets you build custom iOS 4.3.1 firmware to which you later restore your iPhone via iTunes.

Jailbreak iOS 4.3.1 On iPhone 4, iPhone 3GS

1. Download Sn0wbreeze 2.4 Beta 1 and the required iOS 4.3.1 IPSW for iPhone 4 or iPhone 3GS. All download links given at the end of the article.
2. Launch Sn0wbreeze and go through the initial screens to the IPSW Selection screen.
3. Browse and select the IPSW file you earlier downloaded in Step 1. Let Sn0wbreeze verify the IPSW.
4. Go to the next screen and select ‘Expert Mode’.
5. Select ‘Build IPSW’ in the next screen.
6. Let Sn0wbreeze build the custom firmware for iOS 4.3.1 and place it on your desktop. This may take a while, so you may want to play the included PacMan game while Sn0wbreeze does it’s job.
7. Put your iPhone in DFU mode following the on screen instructions.
DFU Mode:
Hold POWER and HOME buttons for 10 seconds.
Release POWER, but continue holding HOME for 30 seconds.
Sn0wbreeze will inform you when your device is into DFU Mode.
8. Let Sn0wbreeze confirm that your device is in DFU mode with the following message;

Your device is now in a PWNED DFU state (black screen).
9. You can now connect your iPhone to your PC and do a restore using the SHIFT + Restore button in iTunes.
10. Select the custom iOS 4.3.1 firmware Sn0wbreeze has built for you, now lying on your desktop.
Note: If you get error 2003 in iTunes after extracting the custom iOS 4.3.1, then just unplug/re-plug it in and do it again.
Once the installation is done, your iPhone will be jailbroken on iOS 4.3.1 However you will not find Cydia working as this is a tethered jailbreak.
Continue with the below steps to boot your iPhone into tethered mode. Do this every time you restart your iPhone.

Boot Into Tethered Mode

Every time you create custom firmware using Sn0wbreeze, it places iBooty, a small utility that allows you to ‘boot into tethered mode’ on your desktop. In case of iOS 4.3.1, you will find a new folder ‘iBooty-for-4.3.1′ placed on your desktop.
1. Open iBooty-for-4.3.1 folder and double click on the iBooty exe file.
2. Select your device model from the bottom right drop down menu and click ‘Start’.
3. Once again, you are required to put your device into DFU mode.
Press POWER + HOME buttons for 10 seconds.
Release POWER, but continue holding HOME for 30 seconds.
4. Once your device is in DFU mode, iBooty will inject the required code to boot your device into a jailbroken state.
That’s it. Once your device reboots, you will find it complete jailbroken with a working Cydia.

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