Running iOS 5 build apps on the orignal iPhone, iPod touch and iPhone 3G
Have apple introduced the iPhone 3GS they made an major switch in processor architecture, the want from armv6 to armv7.
Now that we have all update to Xcode 4 with iOS 5, Apple seems to be of the opinion that you can drop support of the armv6 architecture.
Well this isn’t always the case, especial for those device that can run iOS 4.*.
Luckily you solve this very easily, go to the the project build setting.