Step-by-step Tutorial: jailbreak iOS 4.2.1 on iPhone/iPod/iPad using PwnageTool 4.2 (Mac OS)
UPDate: Attention! We've received info, that Apple stopped signing iOS 4.2 for devices for which iOS 4.3 is available. This means you will not be able to restore to 4.2.1 without saved SHSH keys.
UPDATE: Please, consider reading our Jailbreak & Unlock FAQ, especially if you have questions or troubles.
Using this tutorial you will be able to jailbreak iOS 4.2.1 running on iPhone 3G, iPhone 3GS, iPhone 4, iPod Touch 3G, iPod Touch 4G and iPad. Pwnagetool will also preserve baseband version if you need carrier unlock. If you have updated the baseband to version 06.15, you can use this tutorial. This tutorial uses PwnageTool 4.2 for Mac OS X.
We are not developers of jailbreak utilities, so we cannot assure that everything will work just fine. However we tried this tutorial on several devices and succeeded.
We will use iPhone 4 in our jailbreak tutorial. The process is the same for all devices.
Make a folder called "Pwnage" on the desktop. Download a couple of things:
- PwnageTool 4.2 from here
You will also need the 4.2.1 firmware. It is device specific.
- Download iOS 4.2.1 here.
When downloading the IPSW file, it is best to download it with Firefox since Safari often auto extracts it!
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.
Double click to mount PwnageTool then drag the PwnageTool icon into the Pwnage folder.
Then from the Pwnage folder double click to launch the PwnageTool application.
Click Ok if presented with a warning.
Click to select Expert Mode from the top menu bar
Click to select your device. A check-mark will appear over the image of the device. Click the blue arrow button to continue.
You will be brought to the "Browse for IPSW" page. Click the Browse for IPSW... button.
From the popup window select your firmware from the Pwnage folder then click the Open button.
You will then be brought to a menu with several choices. Click to select General then click the blue arrow button.
The General settings allows you to decide the partition size. Check Activate the phone if you are not with an official carrier then click the blue arrow button. For iPhone 3G you can also choose to enable iOS 4 features such as Multitasking, Wallpapers, and Battery Percentage. If you choose to do this please be aware that the performance of your device could suffer.
NOTE*: Deselect Activate if you have an iPhone legitimately activated on an official carrier.
Thesettings menu allows you to create custom packages so you do not have to manually install the necessary them later. If you do not want to install anything here go to next step.
Click to select the Download packages tab. Then click the Refresh button to display all the available packages. Double clicking the package you want will download it and make it available in the Select Packages tab.
Checkmark the ones you want then click the blue arrow button.
The Custom Packages Settings menu displays listed package settings for your custom IPSW. Click the blue arrow button to continue.
Click the blue arrow button to continue.
You are now ready to begin the pwnage process! Click the Build button to select it then click the Blue arrow button to begin.
You will be asked to save your custom .ipsw file. Save it to your Pwnage folder you created on your Desktop.
Your IPSW is now being built. Please allow up to 10 minutes.
You will be asked to enter your administrator password. Do this then click the OK button.
Once your ipsw has been built you will be asked to connect your iPhone to the computer. Once it detects your device PwnageTool will guide your through the steps to putting your iPhone into DFU mode.
Press and hold the power and home buttons for 10 seconds.
Then release the power button and continue holding the home button for 10 seconds.
Once your iPhone is successfully in DFU mode, PwnageTool will prompt you to launch iTunes.
Navigate to the Pwnage folder on your desktop using the dialog window that appears. Select the custom IPSW that was created and click the Choose button.
iTunes will now restore the firmware on your iPhone. This can also take up to 10 minutes. Once done you will be rebooted into jailbroken iOS 4.2.1!
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) install application called afc2add in Cydia.
If you need carrier unlock – install ultrasn0w via Cydia (if you do not need carrier unlock skip this step). Ultrasn0w 1.2 supports iPhone 4 baseband 01.59.00 and iPhone 3G/3GS basebands 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00.
- Open Cydia.
- Go to Manage than click Sources.
- If you see repository http://repo666.ultrasn0w.com, go to step 8.
- Click Edit button in the top right corner.
- Then click Add button in the top left corner.
- Type http://repo666.ultrasn0w.com and click Add Source.
- Then click Done.
- Click on on newly created repository http://repo666.ultrasn0w.com.
- Click on ultrasn0w and hit Install button in the top right.
- One installed, restart your iPhone.
- Disable 3G on T-Mobile USA.
- You're done! You should see the network.
Do not forget to change your default password if you've installed openssh.
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