How to Upgrade Your iPhone 4, 3GS Without Updating the Baseband (Windows)

How to Upgrade Your iPhone 4, 3GS Without Updating the Baseband (Windows)

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nikobab - March 18, 2013 at 4:22pm
Does this work for anybody? As I understood there are no positive comments. I am stuck with unlocked jailbroken 3GS 4.2.1. baseband 6.15.0, GPS not working, trying to find a way to update my IPhone, keep it unlocked, get GPS back. Any advices (as simple as possible please I consider myself advanced user but I don't have time to sit for hours...) Thank you!