Hello, i get the above error after updating and reinstalling grub using a /boot/efi partition following the official manjaro uefi instructions. My mobo uses hybrid uefi bios meaning it is bios based but uses an uefi loader on top of the legacy bios.
I figured it out. My mobo can only boot from esp/boot/efi/EFI/boot/bootx64.efi instead of esp/boot/efi/EFI/manjaro/grubx64.efi so i just copied grubx64.efi to esp/boot/efi/EFI/boot/ and renamed it as
bootx64.efi.After that my pc was able to boot and use the updated grub but i couldnt get the grub-menu to be visible at boot no matter what, so i got fed up with grub, removed and deleted all grub files from root&esp and installed refind with:
refind-install --usedefault /dev/sda1
where sda1 is my esp partition