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Unlock iPhone 3GS on iOS 4.1 Using Ultrasn0w

Apple has recently released iOS 4.1. As anticipated, updating to iOS 4.1 also updates the baseband of your device to 2.10.4. However, if you update your jailbroken device to iOS 4.1 while preserving its baseband then you can easily unlock it with Ultrasn0w. If you jailbreak your iPhone 3GS(old Bootrom) with PwnageTool, it won't update the baseband and you can unlock it using Ultrasn0w 1.1-1.

Steps to Unlock iOS 4.1 on iPhone 3GS (old bootrom) with Ultrasn0w 1.1-1

  1. First jailbreak iOS 4.1 on iPhone 3GS (old bootrom) using PwnageTool. Refer to this guide for step wise procedure.
  2. Once jailbreaked, open Cydia on your jailbroken iPhone.
  3. Ultrasn0w 0.93

  4. Click on the "Manage" button at the bottom.
  5. Click on the "Sources" section.
  6. Ultrasn0w 0.93

  7. Click on "Edit" button at the top left of Cydia.
  8. Click on "Add" button at the top right of Cydia.
  9. Enter as Cydia/APT URL and click on "Add Source" button.
  10. Ultrasn0w 0.93

  11. Wait while Cydia update your sources.
  12. Ultrasn0w 0.93

  13. Thats it! Now click on the "Search" tab at the bottom and search for "ultrasn0w 1.1-1". This app will automatically unlock your iPhone so that it can be used it with any official / unofficial carrier.
  14. Ultrasn0w 1.1-1

  15. Just restart your iPhone and you are good to go. Now, you should have fully unlocked and jailbroken iPhone 3GS on iOS 4.1.

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Leave a message...

    irome10 years, 2 months ago

    If i jailbreak IOS 4.1 thru greenpoison, can I still follow this to unlock the Iphone 3G? thanks..

      Wolverine10 years, 2 months ago

      Yes but only if your iPhone 3G has unlockable baseband. What is your current baseband version btw?

    Steve jobs4theboys10 years, 10 months ago

    Thank you. well written & laid out.

    denebola10 years, 10 months ago

    I did as it said but when I installed ultrasn0w, it doesn’t work, stuck in “Searching…” and my iPhone working slowly and not responding, any idea?