This is a popular script-based tool used by the Legacy Jailbreak community to downgrade older devices. It may allow for iOS 5 installation if you have specific hardware/software configurations.
Enjoy the classic "Skeuomorphic" design (glass, leather, and linen textures). downgrade iphone 4s to ios 5
Follow the on-screen prompts to enter : Hold Power and Home for 10 seconds. This is a popular script-based tool used by
If successful, you’ll see the screen with the old iOS 5 wallpaper. downgrade iphone 4s to ios 5