I too need an urgent fix for this. I have made a bootable installer but start up disk refuses to see it so i cant even do a clean install.
There has to be a service or something it cant get past.
BTW MacBook Air retina. Are we all on the same machine?
D3GGY
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Same here. I can however boot into safe mode and it shows I am on BIG sur. I assume its down to an extension or plug in but I have been through all of them and no joy. In normal mode I get to 5% approx loading then nothing need a fix urgently