circuitpython/ports/esp32/boards/deploy_c3.md

Program your board using the esptool.py program, found here.

If you are putting MicroPython on your board for the first time then you should first erase the entire flash using:

esptool.py --chip esp32c3 --port /dev/ttyUSB0 erase_flash

From then on program the firmware starting at address 0x0:

esptool.py --chip esp32c3 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x0 esp32c3-20220117-v1.18.bin