MR816x Device Not Found

Steinberg Hardware Legacy Steinberg Hardware
2
  1. System Preferences
  2. Go to Security and Privacy
  3. Go to Privacy Tab
  4. Click on on the Lock at the bottom to make changes, enter your password, click Unlock
  5. Click on the MR Editor box and the Yamaha Firewire Control Panel box
  6. Click the lock , done

Also, you need to go to the security settings when installing the drivers and allow them to be accessed if I recall. So uninstall the driver, extension and MR console using the installer app. Re- install then go to the security settings and see if it asks to allow the installation.

Try a

  1. Reset NVRAM, Option+Command+P+R while booting up, hold until 3rd chime then let the keys go
  2. Reset SMC, Shift+Control + Option, NOTE: SMC reset may be diff depending on which Mac you are using