Nix iso unable to boot in UEFI mode (but other distros can)

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I’m having the same issue. Already tried older ISOs like 23.05 and 22.11, and even 24.05pre, without any difference.
After the last post by canguy247 (#23) I tried making the following changes in the 23.11 ISO:

  • rename /EFI/boot as /EFI/BOOT
  • rename /EFI/BOOT/bootx64.efi as /EFI/BOOT/BOOTX64.efi
  • change any reference to this file/folder inside /EFI/BOOT/grub.cfg and inside /boot/grub/loopback.cfg

This helped booting the ISO, but got stuck after the grub menu with the following error (after starting systemd-udev):
An error occurred in stage 1 of the boot process, which must mount the filesystem on '/mnt-root' and then start stage 2.

Any possible fix to this issue? Even if it needs to manually edit the ISO

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