How to Jailbreak iPhone 4, 3GS on 4.2.1 with PwnageTool 4.1.3 & Unlock with Ultrasn0w

iOS hacker Nadeem Ateyeh has released PwnageTool Bundles for iPhone 4 and iPhone 3GS to jailbreak the device on iOS 4.2.1 without upgrading its baseband. This is an untethered bundle for use with PwnageTool to create custom iPSW preserving the Baseband and also booting untethered and Jailbroken. Ultrasn0w unlockers can use these bundles for later unlocking it using iPhone Dev Teams ultrasn0w tool.

How to Jailbreak iOS 4.2.1 iPhone 4, 3GS using PwnageTool

Requirements:

• Download PwnageTool 4.1.3 for Mac

iOS 4.2.1 original firmware of your device saved on your computer download :

• Download iOS 4.2.1 iPhone 4
• Download iOS 4.2.1 iPhone 3GS
• Download iOS 4.2.1 iPhone 3G
• Download iOS 4.2.1 iPod touch 2G
• Download iOS 4.2.1 iPod Touch 3G
• Download iOS 4.2.1 iPod Touch 4G
• Download iOS 4.2.1 iPad
• iTunes 10.1.2 installed on your Mac

Modifying PwnageTool

Step 1: Download PwnageTool bundle (via) for your iPhone 4 device. Extract the .zip folder, and copy iPhone3,1_4.2.1_8C148.bundle (for iPhone 4) or iPhone2,1_4.2.1_8C148a.bundle (for iPhone 3GS) to your desktop.

Step 2: Download PwnageTool 4.1.3 and copy it to your desktop. Right click, and then click on “Show Package Contents”

Step 3: Copy the .bundle files to PwnageTool.app/Content/Resources/FirmwareBundles/

Step 4: Copy info.plist goes inside PwnageTool.app/Content/Resources/CustomPackages/CydiaInstaller.bundle/   (IMPORTANT IF YOU WANT CYDIA IN YOUR IPSW)

Building a Custom Firmware

Step 1: Launch latest version of iTunes 10.1.2 and sync your iPhone 4 with your Mac for backup.
Step 2: Double click to start PwnageTool. Click Ok, if prompted with a warning. Click to select Expert Mode from the top menu bar and then select your iPhone 4 or 3GS. Click Blue arrow button at the bottom right to continue.

Step 3: Click the Browse for IPSW… button and then select your firmware from the Pwnage folder (refer Step 2).

Step 4: You will be prompted to select one of the option from following window. Select General then click the blue arrow button to continue.

Step 5: Under General settings “DO NOT” check Activate the phone. This bundle supports legit activation only

Step 6: Under Custom Packages Settings menu Select Cydia to make sure its added to the IPSW.

Step 7: You are now ready to begin the pwnage process! Click the Build button to select it then click the Blue arrow button to begin.

Step 8: PwnageTool will now create the custom .ipsw file for your iPhone. You will be prompted to save custom .ipsw firmware file. Save it to the desktop. It might take 10-15 minutes for building custom firmware.

Step 9: Now its time to restore your iPhone 4 or iPhone 3GS to this custom firmware iOS 4.2.1.

• Click on your phone icon from the sidebar in iTunes.
• Press and hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” (Not “Update” or “Check for Update”) button in the iTunes
• Now, release the “Shift” button.

Step 10: iTunes will now prompt you to select the location for your custom firmware 4.2.1 Once your iPhone 4 / 3GS is successfully in DFU mode.

Step 11: Once In iTunes, hold the Alt/Option key and click Restore.

Step 12: Now select the custom IPSW that was created and click the Choose button. Wait for a while till iTunes installs the new firmware 4.2.1 on your iPhone. After the installation is done, iPhone 4 or iPhone 3GS will restart automatically. You have now successfully jailbroken iPhone running iOS 4.2.1.

Step 13: After jailbreaking iPhone 4 / 3GS on iOS 4.2.1, you can now restore all your settings, apps, contacts and photos to the newly installed firmware version iOS 4.2.1 by restoring the backup that you made in Step 1 from iTunes.

Those who were earlier unlocked on baseband 01.59.00 can now proceed further to unlock their iPhone 4 using ultrasn0w.

Step 1 - Jailbreak your iPhone 3G or iPod Touch 2G with Redsn0w [Guide here].

Step-2 - Start ‘Cydia’ on your jailbroken iPhone 3G or iPod Touch 2G springboard.
Step 3 - Select ‘Manage’ tab at the bottom of your iPhone screen and then select ‘Sources’.

Step 4 - Select ‘Edit’ and then select ‘Add’. Now enter a URL source. Type ‘repo666.ultrasn0w.com‘ and select on ‘Add Source’. Once Cydia has added the source click on ‘Return to Cydia’ button.

Step 5 - Once the installation is completed. Search for ‘ultrasn0w 1.1-1′ in Cydia and install it.

Step 6 - This app will automatically carrier unlock your jailbroken iPhone 3G and iPod 2G.

Step 7 - Reboot it.

Voila! You have now successfully unlocked iOS 4.0.2 iPhone 3G and iPod Touch firmware running 05.13.04 baseband.