The volumes that currently house your copy of macOS Catalina will have to be erased in order to convert the two special Catalina volumes (one read-only system volume and one read/write data volume) back to a format that is usable by the earlier versions of the Mac OS. With any of the downgrade methods, you’re going to lose all the data currently on your Mac. Use Time Machine to restore from a date when your Mac was using a previous version of the o perating system.
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