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If the system's UEFI firmware fails to find GRUB's EFI bootloader file, using the default boot loader location should provide a working solution. This circumvents the boot menu managed by efibootmgr and thus offers reduced functionality, but is less error prone. To do this, verify the EFI partition is mounted at /boot/efi then copy the file grubx64.efi located at /boot/efi/EFI/gentoo/grubx64.efi to /boot/efi/EFI/BOOT/BOOTX64.EFI. This example assumes a 64-bit UEFI system, adjust accordingly for 32-bit UEFI systems.