I’m not sure if this provides any clue to what’s happened but this all started after I actually got through to the installer at one point. ie, EFI was recognized, bootloader loaded, I ran kext injections, got to installer point, but then got an error (attached). I read this was because bios date was out of whack so I went into terminal from there to correct it, which I did, but then couldn’t get out to go back to installer so I restarted. Ever since that point was when the EFI recognition issue started.
Having said that, with multiple different USB’s created, CMOS being cleared, etc, I would have thought that any ‘memory’ of such an event is long gone?
Could I be wrong about that? And if so, what would be the link?