Thanks @alessandro morniroli, I'll look into the SAU setup and see if I can fix things there.If I'm not able to resolve it I'll start a new conversation.

Hi @Billy OWEN ,I was wondering if this question was ever resolved, since I have the same issue. In my case, I'm working with the STM32H5, but as with the U5, PGSERR is set if the nonsecure STRT is set from the secure domain. Is it possible to perfor...