micropython/ports/stm32/boards/MIKROE_QUAIL/deploy.md

Quail via DFU

Quail can be programmed via USB with the ST DFU bootloader, using e.g. dfu-util or pydfu.py.

To enter the bootloader press and release the Reset button while holding the Boot button. Alternatively, you can use machine.bootloader() from the MicroPython REPL.

dfu-util --alt 0 -D firmware.dfu