I developed an iOS application in Flash builder 4.5 with flex 4.5.1 extension using AIR 2.6. This application is successfully installed on iPhone4G. When I tried to install it on iPhone 3GS it say, this application is not compatible with this iPhone.
My iPhone 3GS is running iOS 4.2.1
Is the iOS version 4.2.1 is not supported for Flex iOS app development or there is any other issue. Please help, thanks in advance.
Yes AIR 2.6 is compatible with iOS 4.2.1.I'd recommend you update to the latest version of FB and AIR. You should download the free upgrade to Flash Builder 4.6 and build from there. It's much improved and AIR 3.x has better performance all around.
Regarding the incompatibility issue, you're absolutely sure you have an iPhone 3GS and not the 3G? They look nearly identical. One sure way to tell is to plug it into iTunes and see if you can upgrade the OS to the latest iOS 5.x. If you can't upgrade to iOS 5, then it's for sure a 3G and is not compatible with AIR 2.6+