I have a DT 25 and I'd like to update the firmware, but I don't own a midi interface. Can I use the HD500 as my interface? Will Line 6 Monkey see the DT25 and update? And if so, how do I do it?
No, unfortunately you can't. The MIDI ports on the HD500 aren't supported as MIDI ins and outs by the driver, so your computer won't see them. You have to use a USB to MIDI adapter. The one Line 6 recommends is the M-Audio Uno.