Not every updates allow rollback to previous version, it also depends on ipsw if they have the previous versions signed, from my past experience, I couldn’t downgrade OS coz they were unavailable very quickly after the new updates release...bad day bad move...and gotta stuck with it, and it certainly ruin up the whole user experience...

Haha..small screen is good for some people who need the compact size, but using a laggy one is a torture