[ffgjgf1]

> I think the answer would be "yes".

Hardly. Good luck running non-supported OS’s on iOS devices. So all of the old iphones and ipads are out.

Even on Android only a tiny statistically irrelevant proportion would both with this.

[kcartlidge]

I suspect the mention of OSs that are still supported implied they weren't talking about non-supported but no longer supported OSs. So nothing exotic, just the normal OS on the device but stuck at the old version which was the final one released for it.