how do I downgrade my firmware on my Iphone 3gs
I have a Iphone 3GS with a firmware 06.15.00 and I need to downgrade it to enable me factory unlock it
iPhone 3GS, iOS 4.1
I'm sorry, but Apple does not provide a downgrade path for iOS. Because downgrading is unsupported by Apple we cannot discuss it on these forums, but you can use Google to find information on how to install an older version of iOS on any iDevice.