Unbrick ESC

In case of bricked ESCs (esc-configurator is no longer able to access it), you can flash Bluejay/Blheli_S ESCs using the C2 Interface via an Arduino, ESP32 or similar. The C2 interface is SiLabs' way to flash firmware on their EFM8 MCUs, this is how the MCUs are flashed before a bootloader is in place.

Recommended

When you have an Arduino Uno or Nano you can use our own web based C2 recovery tool. It will guide you through the whole process, flash the Arduino and allow you to flash a HEX file. Make sure you download the correct HEX file from the release section. Flashing the wrong HEX file, may result in broken hardware.

General

Tldr; find the 2 programming pads of each Busybee MCU and flash it using one of the available tools

Additional links:

• Great tutorial by Oscar Liang using the BlHeli C2 interface
• https://github.com/conorpp/efm8-arduino-programmer
• https://github.com/lhartmann/c2_prog_wifi