Someone asked me about uefi support in the live iso.

Answer: No uefi support in the live isos I released.

I repacked the amd64 iso adding /boot and /efi folders from a solydx iso,
as described here -
http://refracta.freeforums.org/post5007.html#p5007

Also added current grub-efi debs to the offline folder.

It boots in virtualbox set to efi mode.

It's still experimental.

It's here -
http://distro.ibiblio.org/refracta/files/other/unofficial_live_devuan_beta_amd64_uefi_repack.iso

-fsr