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The board should be able to flash over UART. Use the GPIO9/PWM1 pin header and pull it low during chip reset (which can be done with the on-board button labelled ESP_RST). This will put the ESP32C3 in Joint Download Mode.

Use PWM5/6 as UART receive/transmit, respectively. Alternatively, the GPIO18/PWM3 and GPIO19/PWM4 pins can be used for USB-Serial-JTAG Download Boot.

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• 12V -> 5V @ 4A Buck Converter + ELRS Board

• https://github.com/ExpressLRS/targets/blob/master/RX/Generic%20C3%202400%20PWM.json

• https://docs.espressif.com/projects/esp-hardware-design-guidelines/en/latest/esp32c3/schematic-checklist.html#strapping-pins

• Altium 365 | 12V-5V 4A Buck + ELRS

• View file
  name 12-5V Buck Converter + ELRS RX.step