This is step-by-step instructions on how to perform untethered jailbreak of your iPhone 4 on iOS 4.3.1 firmware using RedSn0w 0.9.6rc9 for Windows.

UPDATE: Please, consider reading our Jailbreak & Unlock FAQ ^[1], especially if you have questions or troubles.

Important information.

Please think first, before you do something.

If you need unlock - do not update to 4.3.1, use PwnageTool 4.3 or Sn0wBreeze 2.5 to create custom firmware!

Step One

Create a folder on your desktop called Pwnage

Download RedSn0w from here ^[2]. Save it in the Pwnage folder. Likewise, download the latest 4.3.1 firmware from below and place it in the same folder:

iPhone 4 iOS 4.3.1: iPhone3,1_4.3.1_8G4_Restore.ipsw ^[3]

Extract the redsn0w executable from the RedSn0w zip file into the same folder.

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Step Two

***If you are already on iOS 4.3.1 you can skip this step.

Connect your iPhone to the computer and launch iTunes. Create a backup, since all your data on iPhone will be erased.

Select your iPhone from the list of devices on the left. Now hold down Shift and click the Restore button. Restore is preferred as it won't create any wasted space on your iPhone.

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Navigate to the Pwnage folder on your desktop and select the 4.3.1 firmware ipsw. Click the Open button to continue.

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Step Three

Once iTunes has finished updating your iPhone to the desired firmware open the Pwnage folder on your desktop and launch the redsn0w application from the redsn0w folder we extracted earlier.

On Windows Vista or Windows 7 right click the executable and set it to run as administrator in Windows XP compatibility mode.

Step Four

Once RedSn0w opens click the Browse button

Step Five

Select the 4.3.1 firmware ipsw we placed in the Pwnage folder on our desktop then click Open.

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Step Six

Once the firmware has been verified click the Next button to continue.

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Step Seven

RedSn0w will now prepare the jailbreak data

Step Eight

From this window you can select the jailbreak options you would like.

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Make sure Cydia is selected.

Click the Next button to continue

Step Nine

Please plug your iPhone into the computer and make sure its OFF then click the Next button

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Step Ten

RedSn0w will now guide you through the steps to get into DFU mode.

1. Hold down Power button for 2 seconds.

2. Without releasing Power button, hold down both the Home button and the Power button for 10 seconds.

3. Release the Power button and continue holding the Home button until RedSn0w detects the device.

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If you have problems try again. Here is a video showing this Step 10:

Step Eleven

iPhone will reboot

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Step Twelve

RedSn0w will then begin uploading the new RAM Disk and Kernel.

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Step Thirteen

Once this is complete you will be notified that RedSn0w is done. Click the Finish button. When your iPhone finishes rebooting (5 minutes or so) it will be jailbroken with Cydia on the SpringBoard.

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Step Fourteen

When your iPhone has restarted you can run Cydia. Let it do all the necessary updates.

To have access to the root file system of your iPhone (via file managers like iFunBox or iPhone Explorer) install application called afc2add in Cydia.

Step Fifteen

Do not forget to change your default password ^[16] if you've installed openssh.

[via iclarified]

Comments Disabled To "Step-by-step Tutorial: How to Untether Jailbreak iPhone 4 Using RedSn0w 0.9.6rc9 (Windows) [iOS 4.3.1]"

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