Stm32CubeProgrammer is the last most powerful option for DFU and ST-Link firmware update.

https://www.st.com/en/development-tools/stm32cubeprog.html to download

Cube is simple to use, place device in dfu

Search usb, it would see chip connected to usb


Open hex and download


A major down side of Stm32CubeProgrammer is https://github.com/rusefi/rusefi/wiki/HOWTO-DFU#q-i-have-stm32-bootloader-in-device-manager-and-rusefi-console-does-not-update-firmware-whats-wrong

See also [HOWTO-nDBANK](HOWTO-nDBANK)