Just a heads-up for anyone who has issues with "update failed" and "invalid paramter" messages. I got this when upgrading the DT50 last night. I was using an M-Audio MIDI interface with Windows 7. I happened to also have an EMU 1x1 interface (which ironically didn't work with some other gear causing me to buy the M-Audio). I used the EMU interface with a little Windows XP net book and all worked well. The update does take some time, but it went in the first time with this other combination. Don't know if it was the computer operating system or the MIDI interface, but the point is that you should mix up combinations if you can and that may help.