en-us https://www.intensedebate.com/users/5426357 Comments by Fau http://blog.iphone-dev.org/post/26534086824#IDComment443984453 S.O.S Hello, i need some help ! My Brother gave to me a used iPhone 3 GS from UK, the serial number on the box is xx019. For to "format" that iPhone i did the upgrade with iTunes and then the serial number showing on the handset is like this QR12781xxxx the firmware installed is 05.16.05 Is my handset able to unlock ? where can i found a guide for to do that ! do i need to upgrade to 06.15.00 and after to downgrade ? Thanks a lot Wed, 19 Sep 2012 13:36:26 +0000 http://blog.iphone-dev.org/post/26534086824#IDComment443984453