Step-by-step Tutorial: How to (Un)Tether Jailbreak iPhone 3GS Using RedSn0w 0.9.8b7b (Mac OS) [iOS 4.3.5]


This is step-by-step instructions on how to perform jailbreak of your iPhone 3GS on iOS 4.3.5 firmware using RedSn0w 0.9.8b7b for Mac OS.

If you have iPhone 3GS with an old bootrom version 359.3, the jailbreak is untethered. If your device has bootrom version 359.3.2 and higher, jailbreak will be tethered. You can detect your bootrom version using this tutorial.

Tethered jailbreak means that each time you restart your device you will need to connect it to a computer and run redsn0w.

If you have other device, here are links to our RedSn0w 0.9.8b7b iOS 4.3.5 jailbreak tutorials:

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

Important information.

Please think first, before you do something.

If you have iOS 4.3.3 firmware - do an untethered jailbreak using one of our tutorials.

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

Step One

Create a folder on your desktop called Pwnage

Download RedSn0w version 0.9.8b7b or higher from here. Save it in the Pwnage folder. Likewise, download iPhone 3GS firmware iOS 4.3.5:

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


Step Two

Connect your iPhone to the computer and launch iTunes.

Select your iPhone from the list of devices on the left. Create a backup by right-clicking on iPhone name in Devices (iTunes left pane) and choosing Back Up.


If you are already on iOS 4.3.5 you can now skip to step three.

Now hold down Option (Mac) or Shift (Windows) key and click the Restore button.


Navigate to the Pwnage folder on your desktop and select the 4.3.5 firmware ipsw. Click the Open button to continue.


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.


Step Four

Once RedSn0w opens click the Browse button


Step Five

Select the 4.3.5 firmware ipsw we placed in the Pwnage folder on our desktop then click Open.


The window will show up, asking if your iPhone 3GS has a new or old bootrom version. Read the instructions carefully. If you fail to correctly answer this questions nothing bad will happen - you will have to restore in iTunes once again.

If you have iPhone 3GS with an old bootrom - click NO buttin (jailbreak will be untethered). If your device has a new bootrom version - click YES button (jailbreak will be tethered).


Step Six

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


Step Seven

RedSn0w will now prepare the jailbreak data


Step Eight

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


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


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


Step Twelve

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


Step Thirteen

Once this is complete you will be notified that RedSn0w is done. Click the Finish button.


If you have answered NO on Step 5 and you have untethered jailbreak go to Step 14. Otherwise continue:

Once RedSn0w has finished you will need to boot tethered your iPhone. You will need to do it everytime you restart.

Rerun RedSn0w and this time select Just boot tethered right now from the list of options instead of installing Cydia.


When your iPhone finishes rebooting (5 minutes or so) it will be jailbroken with Cydia on the SpringBoard.

Step Fourteen

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 if you've installed openssh.

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