Unlock iOS 5 iPhone 4 & iPhone 3GS With Ultrasn0w 1.2.4 – HOW TO


by casey on October 15, 2011

iPhone Dev Team has updated their unlock tool. The new Ultrasn0w 1.2.4 is now compatible with devices running iOS 5. It can unlock iPhone 4 and iPhone 3GS unlockable basebands on iOS 5 firmware. No new baseband is added to the compatibility list.

Compatible basebands with Ultrasn0w 1.2.4

iPhone 4: 01.59.00
iPhone 3GS: 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00

DO NOT USE WITH the following basebands:

iPhone 4: 02.10.04 / 03.10.01 / 04.10.01
iPhone 3GS: 05.14.02 / 05.15.04 / 05.15.04 / 05.16.01 / 05.16.02

Before you unlock your device with Ultrasn0w 1.2.4, you need to have your device upgraded to iOS 5 firmware while preserving baseband plus jailbreak it. Follow the links below before you follow the unlock guide.

How to Jailbreak iOS 5 after upgrading to iOS 5 while preserving baseband

How To Guide to Unlock iOS 5 on iPhone 4 and iPhone 3GS with Ultrasn0w 1.2.4

Step 1: Launch Cydia on your iPhone device.

Step 2: Now at the bottom, you have to navigate to MANAGE and then click on SOURCES.

STEP 3: Click on EDIT and then ADD. Type the repo: “http://repo666.ultrasn0w.com” and click on ADD SOURCE.

Step 4: Once its done with installation, go to search button at the bottom and type “Ultrasn0w 1.2.4”. Select it to install the package. After that it will restart your device.

unlock ios 5 iphone 4 3gs Ultrasn0w 1.2.4

Congratulations! Your device is now unlocked on iOS 5 on basebands 01.59.00 / 04.26.08 / 05.11.07 / 05.12.01 / 05.13.04 / 06.15.00. Kindly DO NOT use it other than the mentioned basebands.

Here are few other things iPhone Dev Team has told and might be useful for you:

Note: there’s a special “trick” that iPhone3GS owners with baseband 06.15 need for iOS5. During the new setup screens you see when you start iOS5 for the first time, you’ll be asked about Location Services. Be sure to select “Disable Location Services” when asked! Later on in the setup, you’ll have the chance to turn on Location Services again when asked if you want to use “Find my iPhone”. It’s fine to turn it back on at that point, if that’s your desire (or you can always go in and enable it in Settings.app).

Also, some iPhone3GS users with the 06.15 baseband may have tried to install iOS5 using a stock IPSW (even though you should never ever try to use a stock IPSW if you’re an ultrasn0w unlocker). If you did try this, your baseband is probably in an inconsistent state, and you’ll need to reflash the 06.15 baseband again (using redsn0w). Be very careful if you use redsn0w to reflash the iPad baseband — don’t interrupt the process! And please avoid using stock IPSWs in the future Unlockers should never go near stock IPSWs

If you have a baseband that is not compatible with Ultrasn0w unlock, then you can use GEVEY sim to unlock your device.

Unlock iOS 5 With Gevey Sim Possible With Preserved Baseband

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