: The throttle stick is not in the bottom/neutral position at startup. Slow Beeping (2s intervals)

If your V2.3 ESC has a row of 3 or 4 small circular pads (C2K, GND, VCC, RST), it is flashable with open-source firmware like or SimonK .

The V2.3 manual highlights deep customization options that can be accessed via the or an external programming card.

Remember: Ensure your V2.3 is mounted in an airflow path (drone arms, boat hatch vent, car chassis cutout). If it exceeds 70°C (158°F) after five minutes of running, you need a higher amp ESC or a smaller propeller/pinion gear.