IOREF linked to GND

[roland]

If you want to go your own way don’t waste time with Arduino.
https://www.st.com/en/microcontrollers-microprocessors/stm32h745-755.html

 

[nonyx]

I have my own system, with Raspberry and OpenCV, but Arduino make a good slave for low level tasks

For the record, I removed ALL components which can be removed off the PCB (through-hole and SMD), and IOREF is still grounded... The PCB was the issue since the beginning...