…not sure if it was a bug, but none of my other maschines showed this reaction performing an OS-upgrade:
OSX 10.12.5, DT via hub properly shown in audio-midi-setup.
DT connected with main audio+mono in, usb and MIDI-in from multiclock. Port setting ‘Input from USB+midi’. Whole setup is running, tons of usb connections, C6 detects DT at once.
Selecting OS upgrade from menu, starting C6 which begins transfer immidiatley.
DT shows no reaction. Unable to exit upgrade menu, restart is neccessary.
Same procedure with turbo mode off (unable to activate turbo mode on DT), same reaction, nothing happend on DT.
Same setup with another notebook, same result, DT stucks in ‘waiting for upgrade’, multiple restarts to quit.
At least I switched of the MIDI-In, only USB now - and it works: DT showed receiving the sysex and booted flawlessly.