Booting the samsung 840 SSD firmware update iso from grub2

In order to apply a firmware update for my Samsung 840 SSD I had to boot an iso image with the firmware updater. My laptop does not have an optical drive so I decided to to use my grub2 and it’s loopback support.

So I added to

/etc/grub.d/40_custom

the following lines:

menuentry "firmware" {
  set isofile="/boot/ssd840.iso"
  loopback loop (hd0,1)$isofile
  legacy_kernel (loop)/isolinux/memdisk (loop)/isolinux/memdisk
  legacy_initrd (loop)/isolinux/btdsk.img
}

This works quite well. The firmware update process itself is a bit of a pain. At the end it asked to power cycle the SSD. Which is pretty much impossible because it is inside my laptop. After I continued without power-cycling the drive it warned me that applying failed. However that is a false scary message. After power off and power on of the laptop the firmware update was applied.

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