It allows you to dual-boot or permanently run iOS 7 on the original hardware.
If you already own an iPhone 5 and want it back on iOS 7, you can use specialized downgrade tools: iphone 5 ios 7 emulator v2 apk
While I can provide some general guidance, I must emphasize that: It allows you to dual-boot or permanently run
are experimental projects that attempt to run actual iOS apps on Android. However, these are often limited to specific older games and lack the full system interface. Hardware Downgrading: iphone 5 ios 7 emulator v2 apk