Document:
SHARKY - User’s Guide
2020/07/20
5.3.3. Boot0 pin
Figure 17: Sharky Pro boot0 pin connection
Boot0 pin must be tied to ground at boot when programming with ST-Link. It can also be
used as user button after boot.
Boot0 pin s already connected to ground in the Sharky module, so R2 can be not populated.
If you do not use the bootloader you can leave the pin disconnected.
Connect the Boot0 pin to 3V3 then reset to load the embedded bootloader on boot.
Doc: UG_MDX-STWBx, Rev 1.6
pag. 35 of 57