Re: MacBook Air 820-00165 shutting down when trying to boot
I bought a 820-3437 board off eBay last week as 'parts only'. The only fault with it was that it wouldn't boot anything, regardless of OS X version. Wouldn't even boot an old High Sierra SSD or USB installer. So I tried installing a known working clean ME EFI version onto U6100. So your flashing folder fault could still be EFI related.
Also keep in mind that old EFI versions prior to High Sierra won't boot APFS formatted drives and you'll just get the flashing folder icon. They should however boot a USB MAC OS installer though.
I bought a 820-3437 board off eBay last week as 'parts only'. The only fault with it was that it wouldn't boot anything, regardless of OS X version. Wouldn't even boot an old High Sierra SSD or USB installer. So I tried installing a known working clean ME EFI version onto U6100. So your flashing folder fault could still be EFI related.
Also keep in mind that old EFI versions prior to High Sierra won't boot APFS formatted drives and you'll just get the flashing folder icon. They should however boot a USB MAC OS installer though.
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