Issue booting on MacMini after update (Grub/shim problem) (mokListRT)

[ZioCain]

I updated CentOS 7 via

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yum update

Didn't know about shim and mokutils so didn't exclude that from yum.

Now I can't boot it, I can recover the files on it using another live distro (e.g. ubuntu), but when I try to run the rescue mode from a CentOS USB key it gives me the same error:

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Failed to set MokListRT: Invalid Parameter
Something has gone seriously wrong: import_mok_state()
failed: Invalid Parameter

Typical solution found is to:

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cp grubx64.efi shimx64.efi

But the folder in which this file should be ( /boot/efi/EFI/centos ) is completely empty (actually, /boot is empty itself, like not even grub is installed)

Anything else I might try?


I can at least retrive the files... but nothing more than that.

[TrevorH]

https://bugs.centos.org//view.php?id=15522

[ZioCain]

Yeah, thank you, I've been reading that answer for hours and couldn't make it work.
Where is /boot/efi supposed to be?

[TrevorH]

/boot/efi has to be its own filesystem and should already exist if you already have an operating system installed.