Steps to reset after upgrading to Tahoe

So let’s say, purely hypothetically, my friend updated his perfectly fine MacBook Air 2015 (running OCLP) to macOS Tahoe. And let’s also say that this hypothetical genius (which is not me) ignored the massive, flashing, neon warnings all over Reddit that said “DO NOT UPDATE TO TAHOE WITH OCLP.”

Now, hypothetically, my friend’s keyboard and trackpad have both stopped working — which is, of course, completely shocking and unexpected.

What are the steps this totally theoretical person should take to roll back to a working version (Sequoia) without losing all of his hypothetical data? Is there a magical rescue path, or are we talking about a clean reinstall situation here?

Asking for… science.

submitted by /u/THEGM123
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