My experiments have managed to damage my installed system and I am getting alerts that it needs to be re-installed. But when I try to get Recovery to re-install the same system, it refuses. It says my installed system is newer than what it could install. In general, what is the minimum I would need to change or remove from my current system to convince Recovery to re-install? For example: Could I just delete a certain small group of System files? Could I Erase only the Macintosh HD Volume in the container, leaving the Macintosh HD - data Volume intact? I really would rather not ERASE everything and restore it all from backups, just to satisfy Recovery that it will not be writing older over newer. It won't be, but since I have available applied updates, the version available for Restore is currently older than the damaged version on the drive.