I checked with the Uploaded File schematic board.
I'm using STM32CubeProgrammer.
Connect from PC via UART.
I confirmed that the UART is connected with STM32CubeProgrammer.
Software has not been written yet.
In that state, the MCU became so hot that I couldn't touch it.
Could you please tell me the possible reasons?
reset all unused pins and select " set all free pins as analog "
