Just for the info....
I've tried on 2 different computers running Windows XP, both detected a new device and showed "USB audio device" in device manager/audio controllers, video & games, BUT, in control pannel/Sound and audio/ there was no way I could choose Megadrum as the MIDI input or output. The main sound card was the only option.
Then I tried on a third computer, running Vista, and just like Windows 7, it automatically detected the device and appeared as an option in MIDI I/O of the firmware utility.
Conclusion...
I still cant update the firmware. The process remains at 0, exactly like it did when I tried at home