Question:
How to update iPhone 3GS baseband to 6.15.00?
Answer:
Assuming that you are now on iOS 5 baseband 5.16.05, you can do it by downgrading to iOS 4.1 first, and then install iPad baseband, and then you have the option to update to iOS 5 using custom firmware.
Please note that there are risks of updating to 6.15.00; one of them is loss of GPS functionality.
This page has a complete tutorial on how to update your baseband to 6.15.00.
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