FYI for the developers that my OB-6 S/N1217 will not update from 1.5.5 to 1.6.4.
I've tried two Windows 10 machines with USB and two different M-Audio Uno's running MIDI-OX, fiddled with the settings and no go.
I then tried a Macbook Pro and a Mac Mini with USB and two different M-Audio Uno's running Sysex Librarian, fiddled with the settings and no go.
Then I tried my MOTU MIDI Express128 with a Macbook Pro and a Dell Precision laptop, nothing. It counts down from 999 to 0 on every try but never goes to the second countdown (WRITE phase), it just reboots and it's still 1.5.5.
I also have a Prophet-6 and that updated the first try with MIDI-OX and the M-Audio Uno to 1.6.3, although it did get stuck at the "1" on the second countdown, but I waited the prescribed 60 seconds and power cycled it. Works great.
Probably spent 5 hours on the OB-6. I'm a veteran keyboard player, BSEE and an IT consultant nowadays and I'm out of ideas.
Thanks!
Wheat