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Use of D0D1 Arduino pins
If you want to use the D0/D1 pins (not available per default, because used by STLink) you need to close SB62/SB63 and open SB13/SB14 solder bridges.
More info in the user manual:
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/user_manual/DM00105823.pdf