Dev Team has released PwnageTool 4.2 to untether jailbreak iOS 4.2.1. PwnageTool 4.2 uses the greenpois0n‘s exploit to untether jailbreak your iOS 4.2.1 device. It will update your iPhone to pre-jailbreaked iOS 4.2.1 without upgrading to the new baseband so that you can unlock your iPhone 4, iPhone 3GS. You will need a Mac to run PwnageTool 4.2.
Things you need
PwnageTool 4.2 (Download Link)
iOS 4.2.1 for your device
1 ) Now Open PwnageTool and click ‘Expert Mode’ at the top, then click the device you’d like to jailbreak.
2 ) Click “Browse for IPSW and browse for the iOS 4.2.1 you just downloaded.
Step 4: Click ‘General’ and select functions as needed.
- ‘Activate the phone’ – Hacktivates the phone if previously unlocked
- ‘Enable baseband update’ – Performs the baseband update (DO NOT CHECK THIS IF YOU RELY ON A ULTRASNOW UNLOCK)
- There are options to re-enable functionality, which are specifically for the iPhone 3G. If you need them, check them off.
Step 5: Click the arrow to apply the changes.
Step 6: Install custom packages and cydia sources as needed, then click build to save your custom IPSW file, you may be asked to enter your Mac OS user password.
Step 7: When prompted, connect your device via USB and follow the instructions for entering DFU mode.
Step 8: Open iTunes. iTunes will tell you it has detected a device in recovery mode. IMPORTANT: PRESS OPTION AND CLICK RESTORE. Do not simply press restore, this will upgrade your device to stock 4.2.1, and WILL upgrade your baseband (which is irreversible). A dialog box will open and allow you to choose the firmware bundle to restore with. Choose the custom created bundle.
Step 9: Wait for the restore to complete, and enjoy your untethered jailbreak!
Unlockers on an unlockable baseband can simply install ultrasn0w and unlock. For help in installing UltraSn0w use this guide (Link)
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