micropython/ports/renesas-ra/boards/ARDUINO_PORTENTA_C33/deploy.md

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dfu-util

This board can programmed via DFU bootloader, using e.g. dfu-util. To enter the DFU bootloader, double tap the reset (blue) button, or you can use machine.bootloader() from the MicroPython REPL.

dfu-util -a 0 -d 2341:0368 -D build-ARDUINO_PORTENTA_C33/firmware.bin -Q # -s :leave