Argh - I just had a quick google and found this: https://community.st.com/s/question/0D50X0000AwWPPhSQO/dfusedemo-v306-not-working-after-windows-10-update
So it looks like at some point Windows changed something else and broke that flashing tool. It seems they now recommend this one: https://www.st.com/en/development-tools/stm32cubeprog.html
Please can you give that a go and let me know how you get on? If it works I'll change all the docs.
Appearing as STM32 BOOTLOADER is perfect though - that means the hardware is all in the right state and ready to go - it's just the flashing software that's not working.
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