FAQ: Unable to connect to STM32H7 devices, a comment
ST wrote a post Oct 17, 2019 which talks about STM32H7 power supplies. A link:https://community.st.com/s/article/FAQ-Unable-to-connect-to-STM32H7-devicesEspecially SMPS. There is a problem when 100pin package is used, because that package has no SMPS...