Arduino for STM32

I use this board:

STM32F407ZGT6 STM32 System ARM Core Board STM32F407 Development Board F407 Cortex-M4 Single-Chip Learning Board
https://www.aliexpress.com/item/4001089580216.html?spm=a2g0s.9042311.0.0.27424c4dICMrQ7

Schematics
https://github.com/mcauser/BLACK_F407ZG/raw/master/docs ...

@mlundin : great! You have a sharp eye :-) Thx for the solution.

To give it a try: I changed the order of the lines 245 and 246 in
~/.platformio/packages/framework-arduinoststm32/variants/BLACK_F407XX/variant.cpp

PF_9,
PF_10, // PF_10: LED D2, PF_9: LED D1 (active low)


and the correct LED ...

I thought about that, so I measured the connections between LED_D1 and PF9 and also LED_D2 and PF10.
They are connected exactly as in the attached screenshot (extract of the schematics in my first post).

LED_D3 is permanently on, showing power.
LED_D2 is attached to PF10 via R16 (I measured 510 Ω ...

I use this board:

STM32F407ZGT6 STM32 System ARM Core Board STM32F407 Development Board F407 Cortex-M4 Single-Chip Learning Board
https://www.aliexpress.com/item/4001089580216.html?spm=a2g0s.9042311.0.0.27424c4dICMrQ7

Schematics
https://github.com/mcauser/BLACK_F407ZG/raw/master/docs ...