ThinkPad BIOS Update CD via GRUB2

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 "ThinkPad BIOS Update CD" {
        set root='(hd0,msdos1)'
        echo     'Loading memdisk ...'
        linux16  /boot/memdisk iso
        echo     'Loading BIOS ISO ...'
        initrd16 /boot/6quj19us.iso
}