Any tips on doing a clean install of MacOS and getting hold of either Mojave (to boot from USB) or earlier version?

@voidspace To access MacOS recovery mode, hold Command + R at boot:

support.apple.com/en-us/HT2013

Whether that allows you to install Mojave vs. Catalina, I don't know. Thought I went through this myself a few months ago (prior to Catalina's release).

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