Follow the instructions posted below to update your iPhone 3GS or 3G to 06.15.00 baseband and jailbreak it on iOS 4.1 /4.2.1.
STEP 1: Download iPad 3.2.2 firmware file
from here (Required for 06.15.00 baseband).
STEP 2: Download the required
iOS 4.2.1 or
iOS 4.1 firmware file.
STEP 3: Download PwnageTool 4.1.3
from here.
STEP 4: Start PwnageTool 4.1.3 and point it to iOS 4.2.1 / 4.1 firmware file.
STEP 5: You'll now be asked if you want to update your baseband to the 06.15 version. If you are on 05.14 or 05.15 or higher you will need to do this to unlock. You do not need to do this for jailbreak only. Click on YES and then select Browse for IPSW and point it to iOS 3.2.2 you downloaded.
STEP 6: You'll have to choose some options as installing Cydia packages, custom logos and packages. Finally, hit the blue the build button.
STEP 7: You'll be asked to save the cooked firmware. Please allow up to 10 minutes.
STEP 8: When prompted if your iPhone has been Pwned before, we clicked No. It allows for a more thorough restore. Once done, follow the instructions seen on the screen to enter into DFU mode
STEP 9: Now, You will have to restore your iPhone to the jailbroken custom firmware by Clicking on the iPhone icon on the left sidebar of iTunes then hold left “alt” button (“Shift” button on Windows) on the keyboard and then click on “Restore” then release the alt button, Now Select the custom firmware created by PwnageTool and Let iTunes go in a bunch of steps.
STEP 10: Almost done, you can now unlock your iPhone 3GS / 3G by searching and install ultrasn0w v.1.2 from Cydia.
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