I've just bought Nucleo-H745ZI-Q board, installed STM32CubeIDE and generated first project with FreeRTOS and blinking LED on PE1. It also worked, I could download compiled firmware and debug it. Nothing else was connected to Nucleo.

[AKise]

I wanted to try it once more again and STM32CubeIDE can't upload anything and shows me a message it can't connect to target MCU. What should it mean? How can it go broken??? I am very disappointed, nothing connected and MCU is out now. Are you really serious???

[AKise]

It doesn't help anyway, after disconnecting the board it stays frozen.

And I haven't even added a string of code after generating the project from the Cube settings.

[Tilen MAJERLE]

@AK.12iselev​ if you are able to connect to the MCU from CubeProgrammer and erase the flash when pins 5 and 7 are connected (with power-on reset), then the issue is related to SMPS configuration.

[AKise]

Hello, I have finally solved it!

PWR_DIRECT_SMPS_SUPPLY with Power Regulator Voltage Scale 0 option has helped. Now it also works after disconnecting and reconnecting the board.

Thank you for your hints!