Resolved! Nucleo-H755ZI Configure Power Supply
For the Nucleo-H755ZI, I use the 'PWR_DIRECT_SMPS_SUPPLY' choice in 'HAL_PWREx_ConfigSupply', like: HAL_PWREx_ConfigSupply(PWR_DIRECT_SMPS_SUPPLY); With this setting, the board works fine and keeps working after flashing.If you choose for example 'PW...