If AC and/or sound is not working in your premium Mustang, you can connect the unit to the car, then go to setting, advanced, enter 8861 as passcode, and change 'cartypesel' to 'mustang h' instead of 'mustang'. Then, use a pin to push RST button on the plastic panel/trim of the head unit to reboot. If FM radio sound is normal, then all good. Otherwise, harness adapter is needed for the sound to work. Please contact us to get the adapter.
If the hazard button acts up but correct cartype has been set('mustang' for base Mustang, and 'mustang h' for premium Mustang), you can operate a/c, like changing fan speed or temp, then use a pin to push RST button on the plastic panel/trim of the head unit to reboot, and repeat these two operations three times. Then the hazard button should be working normal.