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No device for installation media was detected

$ cat /etc/grub.d/40_custom
#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.

menuentry "Firmware 11.3.0 amd64 netinst" {
        set isofile='(hd0,2)/debian/firmware-11.3.0-amd64-netinst.iso'
        set root='(hd0,2)'
    loopback loop $isofile
        echo 'Loading Linux . . .'
    linux  /debian/vmlinuz boot=/
        echo 'Loading initial ramdisk . . .'
        initrd  /debian/initrd.img
}
u@h ~
$