My iphone6 works perfectly though stuck at IOS 12.5. Wouldnt be a problem except for those stupid developers that decide only IOS13 + is good enough for them
I did the same, but unfortunately iOS 13 added a lot of APIs that are indispensable for modern iOS development.
My own apps are supporting iOS 9.3 though, it’s a good feeling giving people the option to dedicate their obsolete devices to just one function, forever.