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How to erase and restore Catalina OS
Mac mini, macOS 10.14
I, personally, used USB boot drive (I have saved 10.12 ~ 10.15 each OS individually) for this kind of process.
How to create a bootable installer for macOS
You can boot directly from USB drive (by holding "option" key) and access "Disk Utilities" to erase and re-install 10.15.
Restart with the Command and R keys held down, use the Disk Utility to erase the internal drive, and install a fresh OS.
(183411)
Restoring Mac mini
