Hmmm just found an upstream report about the short device path in some Dell machines: https://github.com/rhboot/efibootmgr/issues/86 Upgrading firmware may fix the issue. Or, specify EDD 3.0 explicitly to generate the full device path. E.g. # efibootmgr -c -d /dev/nvme0n1 -p 1 -w -L opensuse-manual -l '\EFI\opensuse\shim.efi' -e 3