I have a fuze v2. I had originally used fw .26 and a rockbox build from mid 2010? Anyway, some said it would be better to use fw .31 from now on instead of .26 as they were designing now using fw .31 //Well I wanted the new rb recently so I simply copied the new rb files over my old rb files method. It seems to work fine but I didn't use the new mamskboot(sp?), bootloader or fw...Is there a disadvantage to this method? It seems to work fine but I'm wondering if I'm missing out on sound quality or other plusses by only copy and pasting- without re-doing it using updated files and fw .31?