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after a security upgrade the high sierra won't boot

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Joined
Apr 5, 2016
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55
Motherboard
Asus PRIME b250m-k
CPU
i3-7100
Graphics
HD 630
after a security upgrade (from App Store) the high sierra won't boot. Open Core 6.3 and the latest versions of kexts. The picker appears, I select the boot partition "HS" but it takes me back to the picker
 

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i must return on windows (laptop) after 6 years macos...☹️
 
I solved it, after 6 forums where no one even dared to suggest something and update high siera on security update 2020-004 and security update 2020-005.
 
I solved it, after 6 forums where no one even dared to suggest something and update high siera on security update 2020-004 and security update 2020-005.
well done :)
 
I solved it, after 6 forums where no one even dared to suggest something and update high siera on security update 2020-004 and security update 2020-005.
How did you manage to fix it? I have the same problem.
 
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