Configure the board:

$ ./tools/configure.sh esp32c3-devkit:nsh

Compile:

$ make

Convert the NuttX ELF file:

$ esptool.py --chip esp32-c3 elf2image --flash_mode dio --flash_size 4MB -o ./nuttx.bin nuttx

Put the board in bootloader mode (press and hold Boot button and click on RST button, release Boot button)
Flash it:

$ sudo esptool.py --chip esp32-c3 --port /dev/ttyUSB0 --baud 921600 write_flash 0x10000 nuttx.bin

• BrainDamage