Recently I had to update the firmware in my ASRock ALiveDual-eSATA2 mainboard. ASRocks only has Windows and DOS Installers. Having neither I came to the following solution to flash the BIOS:

Summary: read [[http://wiki.fdos.org/Installation/BootDiskCreateCDROM|this tutorial on how to rebuild a FreeDos Boot CDROM]]. This just has to be modified a bit.

 * Step  1: Get a Boot CD from http://www.freedos.org/freedos/files (the small basecd.iso worked for me).
 * Step  2: Mount the image: {{{mount -o loop fdfullws.iso /mnt/misc}}}
 * Step  3: Create a directory for the new CD: {{{mkdir ./modified_basecd}}}
 * Step  4: Copy the content of the mounted image to the created directory: {{{cp -ax /mnt/misc/* ./modified_basecd/}}}
 * Step  5: Download the DOS Firmware Update from the manufacturer
 * Step  6: Copy the file to {{{modified_basecd}}}
 * Step  7: Create an iso file: {{{mkisofs -R -D -V "FreeDOS 1.0" -o freedos.iso -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table ./modified_basecd}}}
 * Step  8: Check the created in virtualbox or similar.
 * Step  9: If it works, burn it and reboot from the created CD.
 * Step 10: At the FreeDOS boot prompt just press enter.
 * Step 11: In the next menu choose "1. prepare for Setup"
 * Step 12: Now choose your preferred Language
 * Step 13: Now choose "Run Freedos from CD-ROM (return to command prompt)" - this exits the Setup script.
 * Step 14: At the command prompt you can now type the name of the file you copied at Step 6 (hint: FreeDOS has tab completion).

That's it :)