Trouble booting the proxmox-ve_8.2-1.iso headless serial console via USB

Hi,

I'm trying to do a headless installation over serial console via USB of Proxmox VE onto a Deciso DEC-850 embedded server. I've created the USB installation media twice, once with Rufus and again with Etcher, and either way when I boot to the USB, I get:

Welcome to GRUB!
error: no such device: /.disk/info.
error: no such device: /.disk/mini-info.

Output just hangs, and the Grub menu never appears, so I'm unable to continue with the installation. Any ideas? I'm stuck.

1. I've...

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