Jailbreak iOS 4.3 On iPhone 4, 3GS Using Sn0wbreeze 2.3b1 [How To]

Sn0wbreeze 2.3b1 has been released to jailbreak iOS 4.3 on iPhone 4, 3GS, iPad, and iPod Touch 4G, 3G. iPad 2 however is not supported in this version. Also the jailbreak is tethered, so you are required to boot into tethered mode using the included iBooty utility each time you reboot your phone. Otherwise Cydia and jailbreak apps will not work.

Sn0wbreeze is similar to PwnageTool in that it lets you create custom IPSW firmware to jailbreak iPhone. Also it lets you preserve baseband.

Mac users may like to check out the unofficial PwnageTool Bundles to jailbreak iOS 4.3 on iPhone 4, 3GS, iPad, and iPod Touch 4G, 3G. This jailbreak is also tethered.

Note: Ultrasn0w is broken on 4.3 according to iH8sn0w.

iPhone 3GS users need not use the iBooty method in case they have an old bootrom.

MobileSubstrate is not working, so many jailbreak apps such as SBSettings are broken on iOS 4.3.

Jailbreak iPhone 4, iPhone 3GS By Building Custom IPSW

1. Download Sn0wbreeze 2.3b1 and iOS 4.3 IPSW for your iDevice. All download links at bottom.

2. Launch Sn0wbreeze and go through the initial screens to the IPSW Selection screen. Click Yes when asked ‘Are you seriously sure you want to do this?’.


3. Browse and select the IPSW file for your iPhone. Let Sn0wbreeze identify the IPSW.


4. In the next screen, select Expert Mode’ and proceed.


Later select the option ‘Build IPSW’ and click the Next button.


5.Let Sn0wbreeze build the custom firmware for iOS 4.3 and place it on your desktop.


6. Sn0wbreeze will now prompt you to put your iPhone into DFU mode.


Click ‘Start’ and follow the onscreen instructions to put your iPhone into DFU mode.

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.

7. Connect your iPhone to your PC and open iTunes. Select the device from the left tab and click SHIFT + Restore button.

8. When iTunes prompts you to select an IPSW, browse and select the custom IPSW firmware built by Sn0wbreeze (placed on your desktop).

9. Let iTunes restore your iPhone to this custom built firmware.

Once the installation is done, your iPhone will be jailbroken on iOS 4.3 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, the utility to boot into tethered mode on your desktop.

1. Open iBooty-for-4.3 folder and double click on the iBooty exe file.

2. Wait for the Disclaimer message to disappear after 10 seconds.

3. 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.

Download Sn0wbreeze 2.3b1

Download iOS 4.3 IPSW for iPhone 4, 3GS, iPad, iPod Touch 4G, 3G

Download iTunes 10.2.1

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2 Responses

  1. Pico Baino says:

    Hi, mine is iphone 4 version 4.2.1(8C148) BB 03.10.01. i want to find out if this will preserve my BB when i jailbreak it.

  2. Guaroa Mendez says:

    It’s was good for me, thanks