Solved
Mick P. F.Best answer
Associate III
Jan 27, 2021 2:21 PM UTC
Hello Markus,
I've already solved this problem. I missed a right manual, I could not find it at the STM site, but I found it anywhere in the internet few days ago: I have to connect the board via "User USB" to program access/program the flash! Now it works.
Sometimes it is very useful to have access to and to read the manuals.
Kind Regards,
Michael
