Hello Max,
seam that was it, after doing the update/upgrade tested two other boards, could flash them on first try. As I wrote I’m working with PlatformIO only sind about 5 month, did, beside some small test projects just one bigger home automation project based on Arduino NANO and CAN Bus.
So I did not get yet very deep into PlatformIO, but I think should, it seams its really great stuff.
Thanks again for help. I learned a lot.
Rainer