just switch on with the first disk of the pair in the drive while holding down panel memories 1 to 4. For the rest just follow the instructions in the screen - be SURE to do a checksum on ALL disk BEFORE attempting the upgrade proper. If there is no pressing reason to do the upgrade (since most people can see little or no difference afterwards) think carefully about proceeding since in the unlikely event it fails for whatever reason it will mean a trip back to repair station or factory which now will entail even more hassle than normal.