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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.

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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 '12 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.

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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.

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Will any version of redsn0w do? Or should I download the latest version? –  Koundinya Vajjha Feb 5 '12 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... –  Koundinya Vajjha Feb 5 '12 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 '12 at 20:00

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