krd.iso (Kaspersky Rescue Disk) -- Successfully boot into grub, but cannot launch its Graphic Mode or Limited Graphic Mode. It says "Bad signature", but I haven't found any ways to confirm the ISO's hash sums. Just downloaded twice and got the same error.
Zorin-OS-15.2-Core-64-bit.iso -- No bootfile found for UEFI!
Curiously, I've found that ubuntudde-20.04-amd64-desktop.iso and neon-user-20200507-1116.iso (maybe more) are able to boot in UEFI mode on another computer. Maybe Surface has its own special issues, and I'll try some more ISOs for further test.
Tested on Surface Pro 6 with secure boot disabled:
ubuntudde-20.04-amd64-desktop.iso -- No bootfile found for UEFI!
neon-user-20200507-1116.iso -- No bootfile found for UEFI!
manjaro-cinnamon-20.0-200427-linux56.iso -- successfully boot
manjaro-cinnamon-20.0-minimal-200427-linux56.iso -- successfully boot
manjaro-gnome-20.0-minimal-200426-linux56.iso -- successfully boot
manjaro-lxqt-20.0-minimal-200423-linux56.iso -- successfully boot
deepin-15.11-amd64.iso -- successfully boot
elementaryos-5.1-stable.20200501.iso -- No bootfile found for UEFI!
ubuntu-20.04-desktop-amd64.iso -- successfully boot
ubuntu-budgie-20.04-desktop-amd64.iso -- successfully boot
linuxmint-19.3-mate-64bit.iso -- No bootfile found for UEFI!
lmde-4-cinnamon-64bit.iso -- No bootfile found for UEFI!
linuxmint-19.3-xfce-64bit.iso -- No bootfile found for UEFI!
MX-19.1_x64.iso -- No bootfile found for UEFI!
Fedora-Workstation-Live-x86_64-32-1.6.iso -- No bootfile found for UEFI!
manjaro-gnome-20.0.1-minimal-200511-linux56.iso -- successfully boot
manjaro-cinnamon-20.0.1-minimal-200511-linux56.iso -- successfully boot
manjaro-cinnamon-20.0.1-200511-linux56.iso -- successfully boot
krd.iso (Kaspersky Rescue Disk) -- Successfully boot into grub, but cannot launch its Graphic Mode or Limited Graphic Mode. It says "Bad signature", but I haven't found any ways to confirm the ISO's hash sums. Just downloaded twice and got the same error.
manjaro-mate-20.0.1-200514-linux56.iso -- successfully boot
uos-20-home-desktop-amd64.iso -- successfully boot
manjaro-budgie-20.0.1-200515-linux56.iso -- successfully boot
Zorin-OS-15.2-Core-64-bit.iso -- No bootfile found for UEFI!
Curiously, I've found that ubuntudde-20.04-amd64-desktop.iso and neon-user-20200507-1116.iso (maybe more) are able to boot in UEFI mode on another computer. Maybe Surface has its own special issues, and I'll try some more ISOs for further test.