- Download the UEFI Bootloader: https://bootstrap.gig.tech/uefi-provision
- Create a single partition on the USB Disk and format it in FAT (vfat, fat16, fat32, all should works)
- Create directory
EFI/BOOT
on the USB Disk - Copy the downloaded file from point 1. to
EFI/BOOT/BOOTX64.EFI
(on the USB Disk)
- Set the USB Disk as first (and unique) boot device, in boot order