Delete storyboard xcode 4.2 iOS 5

I was having the same issue trying to get a newly created Xcode 4.2 project running on an iPhone 3G 4.2.1. Here is how I was able to get it to run.

1) Change the Target's "Build Settings" ==> "Architecture" from "Standard (armv7)" to "other". Add armv6 and armv7.

2) Change the Target's "Build Settings" ==> "Valid Architecture" to armv6 and armv7.

3) Change the Target's "Build Settings" ==> "iOS Deployment Target" to iOS 4.2.

4) Open the projects *-Info.plist, remove the setting "Required device capabilities" (note it required armv7)

btw I figured this out when I tried to manually add the app via the organizer and it reported:

Can't install application

The Info.plist for application at /Users/.../TestsDebug.app specifies device capability requirements, which are not met by Dev iPhone 3G

All should work after that. Talk about a PITA.

Comment out (or remove) the window creation and display code in AppDelegate.m as follows:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    // self.window.backgroundColor = [UIColor whiteColor];
    // [self.window makeKeyAndVisible];

    return YES;
}

When using a storyboard, a main UIWindow is created for you automatically. What is happening in your case is that you are creating another white window and putting it over the top of the tab UI.

ALSO - note that the Master/Detail template also gives you a core data option.