Well, not always, but while Apple is still signing iOS 13 it should be possible if you have the installer for it.I've been using the betas for this iOS and the last few have been way better than 13. Make a backup on your computer or iCloud even, update to give it a go. If you don't like it you can always restore back.
Well, not always, but while Apple is still signing iOS 13 it should be possible if you have the installer for it.