Letter box in iPhone5

Question

It works like magic to get rid of the letter box in iPhone5. Just put in the picture Default-568h@2x.png. And the app will open with the NavBar in the top in iPhone5 instead

Answer 1

The simplest way to get back to the letterbox (3.5-inch display) on the iPhone 5 seems to be

1. Remove the 4-inch display sized launch image from the project.
2. Delete the app from the phone.
3. Clean the project using Product > Clean.
4. Install the app to the phone.

I asked how can this be done without deleting the app?, but it doesn't seem to be possible.