Secure Boot Key install failing in setup mode

[Wadewilson]

I have been trying to setup Secure Boot in gentoo, following the wiki article https://wiki.gentoo.org/wiki/Secure_Boot/GRUB. After generating and signing the keys, I change the Secure Boot platform to setup mode to clear existing keys and install the newly created keys. When running

[pietinger]

Are you able to delete your old keys if you go manually into the UEFI(-BIOS) ?

(I did so because efi-updatevar did not work on my old Gigabyte board -> number 3 of:
https://forums.gentoo.org/viewtopic-p-8492354.html#8492354 )
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