How can I upgrade a jailbroken iPhone 3GS from iOS 4.1 to 5.1.1?
Question by M Rajesh Kumar /

How can I upgrade my jailbroken iPhone 3GS from iOS 4.1 to 5.1.1 and preserve baseband?

My firmware: 0615.00
And I have new boot-ROM version 359.3.2

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