Brushless Esc V2.3 Manual ❲95% QUICK❳

No beeps at all, but LEDs flash 3 times. → Cause: The BEC is alive, but the main microcontroller is stuck in bootloader mode. → Fix: Short the “Boot” pad (under the shrink wrap, near the ATMega) to ground while powering on. Then reflash using the Arduino-as-ISP method. You have 3 seconds before it times out.