same problem my last unraid flash drive broken ,so I backup all data in array . then , I setup a new unraid on another server. when I setup vm, same issue. after thinking. I copy <nvram>/etc/libvirt/qemu/nvram/xxxxxx_VARS-pure-efi.fd</nvram> this file from libvirt.img(backup data) paste xxxxxx_VARS-pure-efi.fd to dir /etc/libvirt/qemu/nvram ;and edit vm xml file vm run correctly