As you know Apple released iOS 4.1, the latest firmware update contains baseband update and it’s un-compatible with Ultrasn0w. Fortunately iPhone 3GS with old bootrom can be jailbroken with pwnage tool. You can follow our guide to Jailbreak iPhone 3GS iOS 4.1 with Pwnage Tool (Unofficial). Following are the instructions to unlock iPhone 3GS iOS 4.1 jailbroken with pwnage tool.

iphone4_unlocked

Instructions to install ultrasn0w using cydia :

Step One : Press to launch Cydia Installer from your Springboard.

Step Two : Press to select the Manage tab at the bottom of the screen.

Step Three : Press to select the large Sources button

Step Four : Press the Edit button at the top right of the screen.

Step Five  : Press the Add button at the top left of the screen.

Step Six : Enter http://repo666.ultrasn0w.com as the source url and press the Add Source button.

Note:ultrasn0w is spelled with a zero, not the letter “o”.

Step Seven : Once the source has been added press the large Return to Cydia button.

Step Eight : Press the Done button at the top right of the screen.

Step Nine : Press to select http://repo666.ultrasn0w.com/ from the list of user entered sources.

Step Ten : Press to select ultrasn0w from the list of packages.

Step Eleven : Press the Install button at the top right of the screen.

Step Twelve : Press the Confirm button at the top right of the screen.

Step Thirteen : After installation completes successfully press the reboot.

Step Fourteen : Now press the Home button then power off and power on the iPhone. You do this by holding down the power button for 3 seconds then moving the power slider that appears to the right. Press the power button again to turn on the phone.

Step Fifteen : You should now be able to insert the SIM of your choice!

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Via http://www.ihackintosh.com/2010/09/unlock-iphone-3gs-ios-4-1-with-ultrasn0w/

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