Grub2 Boot Debian ISO form Flash Drive

set timeout=10
set default=0

menuentry 'Debian ISO' {
  set isofile='/debian.iso'
  loopback loop $isofile
  linux (loop)/live/vmlinuz1 boot=live config fromiso=/dev/sdb1/$isofile
  initrd (loop)/live/initrd1.img
}
menuentry 'Debian ISO 2' {
  set isofile='/debian.iso'
  loopback loop $isofile
  linux (loop)/live/vmlinuz1 boot=live config findiso=$isofile
  initrd (loop)/live/initrd1.img
}