Following an iOS 14.7+ update, Xcode 12.4 is no longer able to develop for that iPhone model.
The most recent iPhone will have alongside it when selecting a Build Destination in Xcode (Product > Destination > [device] or from the UI menu shown below:-
(unsupported OS version):
iPhone listed with "(unsupported OS version)".
Big Sur and Xcode 12.5 upgrades are not possible.
I can't upgrade to Xcode 12.5 since I'm stuck on Mac OS Catalina (ancient hardware) and it needs Big Sur.
How may device support be added to or updated in Xcode so that we can develop for an unsupported iPhone version (iOS 14.7+)?