updating bios / firmware with help of linux, without cds and usb pendrives

from time to time i have to upgrade different types of firmwares in PCs – sometimes it’s bioses, sometimes raid/network/ssd firmware. until now i was either burning cd-rw with iso provided by the vendor or making some bootable usb pen-drive with free-dos or sth similar.

but i stumbled on this one and it worked surprisingly well.

under debian i had to:

  • install syslinux
    apt-get install syslinux 
  • place the iso file provided by the vendor in my boot filesystem partition [in my case it was also root]

  • modify grub to include:

    menuentry "firmware" {
        insmod part_msdos
        insmod ext2
        set root='(hd0,msdos1)'
        linux16 /usr/lib/syslinux/memdisk iso
        initrd16 /isoWithFirmwareUpgrade.iso


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