I don't know if you're talking to me Rik or whether you're talking to Pedro.

In any event, we both agree that changing the firmware can be done and that there are a couple different ways that it can be done. I had contemplated changing to the 465 firmware for my roommate's 255W, since I can't use the other method you linked to (S4 motherboard). But, if the OP isn't willing to go through the steps necessary to make it happen there's not much we can do except talk in circles.