Instructions:

1. Extract / copy all files in the ZIP file into a separate directory, i.e. Toshiba
2. Click Start>Shutdown>Restart in MS-DOS mode
3. at the C:> prompt, change directory to the one you created in step 1. (CD TOSHIBA)
4. type update.bat
5. F/W will now be updated,
6. (you may be prompted to insert a disk, any CD will do)
7. Wait for Flashing to finish.
8. Reboot PC

[Disclaimer]
  Toshiba will not accept responsibility for any damages incurred due to use
  of this software.
  
This software is provided "as is" and should be used by technically
  experienced persons only.