UEFI doesn't work, right? No, it seems to be fine even on boards going back to about 2006-2009.
Today I show the long forgotten knowledge that has been lost to time since the early 2010's and the onset of UEFI - AHCI. And why we've been approaching the problem from the wrong angle completely.
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https://www.youtube.com/watch?v=EXxFoGJGjJI