Nucleo ST Link to Maple Mini connections - Shtucer/Arduino_STM32 GitHub Wiki

This great short guide was posted by Madias in the forum: (Quick and dirty) upload Bootloader on a maple mini with any nucleo board (via ST-Link 2.1) Disconnect both CN2 jumper (left bottom) on nucleo

• SWD connector:
• Pin1: VCC (not working for me? Take any VCC pin and connect it to "Vin" on the mini)
• Pin2: SWCLK -> D21 on mini
• PIn3: GND -> GND
• Pin4: SWDIO -> D22 on mini
• Pin5: NRST -> RST on mini
• Pin6: SWO (nothing connected)
• Get your maple mini into the serial bootloader mode: Hold both buttons (reset + button) and then release the "reset" button (maybe not needed if maple isn't freezed)
• now drag&drop any *.bin file (bootloader) in your finder/explorer to upload it.