Just got my H9 Max yesterday. Similar problems. I can connect over USB or Bluetooth, but the device seems to lock up showing V 5.8.5. All buttons are unresponsive. Trying to connect with Control app says communication error. Error message says power cycle with hotknob and right footswitch held down. So I tried that, it comes up with “clear” but again, all buttons unresponsive. Still can’t connect with Control app.
I’m using Mac OS 11.2.3, is it compatible?
