I need some help getting UM 21.10 usb installer recognized as a bootable drive. Right now, when loading the boot options, only the already installed MacOS HD is listed.
I used Disk Writer to write to thumb drive, and I verified that it's correct.
Here are the EFI files:
/EFI/boot/bootx64.efi /EFI/boot/grubx64.efi /EFI/boot/mms64.efi
Here is the drive layout after writing the image:
I do notice that the EFI path and file names are
/EFI/boot/bootx64.efi, and I think I saw someplace that Macs look for
/EFI/BOOT/BOOTX64.efi. Could the alpha-case be the issue?