You can’t obviously, but you still can jailbreak ios 9, install any cydia tweaks including desktop, console and emulator apps, as well as downgrade it to ios 6,

You can’t obviously, but you still can jailbreak ios 9, install any cydia tweaks including desktop, console and emulator apps, as well as downgrade it to ios 6, if more working cydia apps are needed. Of course the are in half dead state, but you still can do whatever you want with iOS (if you know how).