The iOS firmware was released a day before and the jailbreak guide for the iPhone 3GS on iOS 4.1 firmware was released with Unlock iPhone 3GS 4.1 Firmwarean unofficial PwnageTool. Now it is time to unlock iPhone 3GS 4.1 firmware. Follow the steps given below to unlock iPhone 3GS 4.1 firmware.

NOTE: You could now use the guide given here instead of this.

1. Jailbreak iPhone 3GS on iOS 4.1 using the guide given here.

2. Launch Cydia.

3. Choose the ” Manage ” tab at the bottom.

4. Choose the ” Sources ” option.

5. Tap the ” Edit ” button and then on the ” Add ” button.

6. Then add the source ” http://repo666.ultrasn0w.com “.

Unlock iPhone 3GS 4.1 Firmware

7. After the source is added, search for ” ultrasn0w 1.1-1 ” in Cydia.

8. Install the Ultrasn0w 1.1-1 app to unlock iPhone 3GS 4.1 firmware.

Unlock iPhone 3GS 4.1 Firmware

9. Restart your iPhone 3GS.

That’s it! Now you have an unlocked iPhone 3GS running iOS 4.1.