Disconnect the battery and press the brake pedal. If you quickly hook the battery back up and you won't loose your presets.
i think a hard reset requires u to physically disconnect the ECU harness for a few minutes... u need to do that when changing vendor codes on AP
I believe a hard reset is disconnecting both terminals from the battery and then touching them together this grounds the car out. Then step on the brake peadle about five times to disbearse any energy left in the car.