Inconsistent behaviour on NUCLEO-H755ZI-Q

[RNiel.2]

Hi,

I am currently working on a project using the NUCLEO-H755ZI-Q development board.

I am testing with a simple program that turns on the green led and goes to a while loop. I start with "full chip erase" then flash my testing program to the M7 core. I have an issue with one of my nucleo boards where it sometimes get stuck(?) during startup. When I press the reset button on the board it's 50/50 if it will boot up correctly and light up the green LED, or go into a stuck state where I can't reprogram it.

I have a second identical board to test with that doesn't have this issue. I have tried in CubeProgrammer to export all the settings from the "good" board and import them to the "bad" board, but it didn't change the behaviour.
I have also looke at the "-ob displ" output and only the serial number was different.

Any ideas of what to try next?

[Mike_ST]

Hello,

Please check that BOOT0 pin is not floating and set to 0V.

Check these articles for common problems with STM32H7:

How to unbrick an STM32H7 after setting the wrong power mode 

Unable to connect to STM32H7 devices