You can now jailbreak iOS 5.1 firmware. The iPhone Dev team has packaged the Geohot’s limera1n exploit into Redsn0w 0.9.10b6 (both Mac and Windows) which allow you to jailbreak iOS 5.1 running on iPhone 4/3GS, iPod touch 4G/3G and iPad 1G. Users with iPad 2 and iPhone 4S need to wait for few days until we hear something from hacker’s camp.
Since the nature of iOS 5.1 Jailbreak is tethered, you are required to plug your jailbroken iPhone, iPad or iPod touch into computer and re-run the process to get your iOS device up and running again, every time when the battery drains out or you inadvertently shut-down your phone or you are forced to reboot it after having issues. Failing to do so will leave your device at the “connect to iTunes” screen. But BigBoss’ Semi tethered jailbreak eases the pain.
BigBoss’ “semi tethered jailbreak” allows you to reboot your iPhone and use stock apps but with some limitations. The semi-tethered jailbreak solution comes handy when you shut down the iPhone while travelling. With this little hack you are no longer stranded and you can reboot your device and use your phone, text, and many other features, which otherwise is not possible. Jailbreak tweaks and settings cannot be used until you boot tether your iPhone, iPad or iPod touch, however.
Redsn0w 0.9.10b6 supports iPhone 3GS (Old Bootrom, new bootrom), iPhone 4 (GSM, CDMA), 1st-gen iPad, iPod touch 3G, iPod touch 4G. It does not support Apple TV2, iPhone 4S and iPad 2 right now. The reason the untether won’t work as-is on the iPad 2 or iPhone 4S is that it requires a bootrom or iBoot-level exploit to install, and the iPad2 or iPhone 4S is not susceptible to the limera1n bootrom exploits.
Note for iPhone Unlockers
ultrasn0w unlockers must create custom IPSW iOS 5.1 which will protect their baseband firmware from being upgraded. iPhone 4 and iPhone 3GS owners can use redsn0w’s “Custom IPSW” button to create a NO_BB_* version of the 5.1 IPSW and restore to that instead of the stock one. If you try restoring your iPhone to a stock Apple IPSW, your iPhone will be locked. iPhone Dev Team is hard at work to update ultrasn0w unlock for 5.1 compatibility and will be released in the next few days. However, it will support only older basebands – 01.59.00, 04.26.08, 05.11.07, 05.12.01, 05.13.04, 06.15.00.
Steps to create custom 5.1 iOS firmware to preserve Baseband
- Launch Redsn0w, select “Extras”, and then select “Custom IPSW”.
- Locate your iOS 5.1 Stock firmware then the Redsn0w will run a number of background processes to create custom IPSW which is pre-jailbroken with preserved baseband.
- Navigate to Extras > Pwned DFU and restore to your custom iOS 5.1 firmware (created in step 2) using iTunes. You’ll then be able to unlock your iPhone with GEVEY or Ultrasn0w.
Note: We haven’t tested Gevey SIM or any other SIM interposer yet.
Here’s the full guide on how to Semi-Untether jailbreak your iOS 5.1 Device using Redsn0w 0.9.10b6 on Mac OS. Steps are same for Windows users.
- An iPhone 4, 3GS or iPod Touch 4G, 3G or iPad 1G
- Latest iTunes installed on your computer.
- Download iOS 5.1 on your desktop.
- Download Redsn0w 0.9.10b6 [Mac OS, Windows]
Step 1: Run Redsn0w 0.9.10b6 and click the Jailbreak button.
Step 2: Connect the iPod Touch or iPhone or iPad to Windows or Mac via USB cable. Make sure it’s OFF then click the Next button.
Step 3: You will be prompted to put the iOS device in DFU mode. Follow the on-screen instructions. To enter in DFU mode: Press the Home and Power together for exactly 10 seconds. Release the Power button and continue holding the Home button until RedSn0w detects the device.
Step 4: Now you “MUST” boot tether your iOS device. To do so, launch iPhone Dev Team’s RedSn0w tool and select Extras then Just boot from the menu (as shown in screenshot below) to boot your device tethered.
Steps for Semi-Tethered Jailbreak
Step 1: Launch Cydia from your Springboard.
Step 2: Enter http://thebigboss.org/semitether into the field and tap the Add Source button. Then, press the large Return to Cydia button.
Step 3: Select thebigboss.org from the list of Sources
Step 4: Select SemiTether from the listed Packages and then press the “install” button at the top right of the screen.
Step 5: When prompted, press the Confirm button to start the installation process.
Step 6: Finally, Press the large Reboot Device button to reboot your iOS device without hanging at the Apple logo.
You have now jailbroken your iPhone 4/3GS – iPad 1G – iPod touch 4G/3G on iOS 5.1 (semi-tethered) successfully. If you have any query or issue, feel free to contact @JAlLBREAKS.