running iOS 7.1.2 is considered desirable because it is significantly more usable for basic tasks than it would be on iOS 9. How to Get iOS 7.1.2
includes full translucent "blur" effects in the Control Center and Notification Center, features that were disabled on the iPhone 4 to save resources. Download iOS 7.1.2 for iPhone 4[S] model iPhone...
Standard methods for obtaining iOS 7.1.2 depend on your current software version: running iOS 7