I recently updated my iPhone 3GS to iOS 5.0.1, and the baseband got updated to 06.15.00. I jailbroke it using redsn0w 0.9.10b1.

Now no matter what I try, I'm not able to unlock my iPhone. I tried installing Ultrasn0w, but that's not working.

I suspect that this is happening since I didnt preserve the baseband.

I'd be very very thankful if anyone can tell me how to proceed right now. I'm stuck and I'm really in need of help. Please.

  • Be careful! If your 3GS was made after the 30th or so week of 2011, you will brick your 3GS by flashing to 06.15.00
    – user18444
    Feb 8, 2012 at 20:25

2 Answers 2


I've used this tutorial before. In fact, I'm using it right now to unlock my boss's iPhone.


Be sure to enable the option "Install iPad baseband" in redsn0w first before running ultasn0w - note that because you are already on 06.15.00 without preserving your baseband, can not go back. Using Ultrasn0w may also cause you to lose GPS functionality. As a general note, be very careful with future updates.

  • Will any version of redsn0w do? Or should I download the latest version? Feb 5, 2012 at 10:00
  • I'm asking this because I enabled the "Install iPad baseband" after an unseccesful unlock attempt first. But even then I wasn't able to unlock my iPhone... Feb 5, 2012 at 10:01
  • You'd probably want the latest version of redsn0w. Re run the latest version with install iPad baseband enabled. Then you should see Cydia installed. Within Cydia download and install ultrasn0w
    – osx86x
    Feb 6, 2012 at 20:00

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