Jailbreak iPhone 4 & iPhone 3GS Version 4.3.1

How to Jailbreak iPhone 4, iPhone 3GS Version 4.3.1 Firmware

Note: If you would like to jailbreak any other iPhone version, visit my comprehensive iPhone Jailbreak guide.

This tutorial contains jailbreak instructions for both Windows and Mac users, using Sn0wbreeze (Windows) and Pwnage Tool (Mac).

Windows Users

Required:

1. iPhone 4 or iPhone 3GS
2. Firmware: 4.3.1 (check your version in Settings » General » About)
3. iTunes 10.2.1
4. iOS 4.3.1 IPSW (iPhone 4 or iPhone 3GS)
5. Sn0wbreeze 2.5

Jailbreak Instructions

1. Open Sn0wbreeze and click Next until you get to the IPSW Selection.

2. Find and select the 4.3.1 IPSW file and allow Sn0wbreeze to verify it.

3. Click Next, then click Expert Mode.

4. Click Next, then click Build IPSW.

5. Sn0wbreeze will prepare a custom firmware and add it to your desktop.

6. Once the process is Done, click OK. Follow the instructions to put iPhone in DFU mode.

7. After this is done, connect your iPhone to your computer and click Shift + Restore within the iPhone area in iTunes.

8. Select the iOS 4.3.1 firmware that was placed on your desktop earlier. Once the installation is finished, your iPhone should be fully jailbroken.

Mac Users

Required:

1. iPhone 4 or iPhone 3GS
2. Firmware: 4.3.1 (check your version in Settings » General » About)
3. iTunes 10.2.1
4. iOS 4.3.1 IPSW (iPhone 4 or iPhone 3GS)
5. Pwnage Tool 4.3

Jailbreak Instructions:

1. Open PwnageTool and click Ok.

2. Click Expert Mode.

3. Select your iPhone model and click Next.

4. Find and select the iOS 4.3.1 IPSW file that you downloaded earlier.

5. Click Build and Pwnage Tool will build a custom firmware, which should be saved to your desktop.

6. Next, enter the username and password of your system.

7. Follow the instructions to put your iPhone into DFU mode.

8. Open iTunes 10.2.1.

9. On the iPhone screen within iTunes, press option (on your keyboard) + Restore (button on the screen).

10. Now browse to the IPSW file that was placed on your desktop in Step 5. Select it. iTunes will do its thing and your iPhone should be fully jailbroken.

Was your jailbreak successful? Please post questions and suggestions in the comments.

Jailbreak iPhone 4 & iPhone 3GS Version 4.3.1 is a post from Apple iPhone Review.

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