Any help please?

I dont think this is possible, But what do i know aye? Thought i would ask the help of the Hackint0sh Forum. Is it possible to update my iPhone 3Gs to iOS5 on 6.15.0 Baseband, And unlock it. Without Jailbreaking, Becuase there is no untetherd jailbreak yet, but i want iOS5 and the iPhone is 02 and im on T-mobile UK

puts the internet to work for you. via task 358721