USB Detection to Reprogram Nucleo Board

[Rico1234]

Hello,

I have programmed a Nucleo-L476RG with the Blinking LED example. Until there is all fine.

Now, I want to load a new program on the board. Windows Explorer and ST-Link do not detect the board and cannot load a new program on the board.

I bought the same board again. It is detected immediately by Windows Explorer and the ST-Link. 

I see one visual difference between the two boards: The LD1 in the "non-detected" board is permanently green while the LD1 in the detected board is permanently red.

Could you give me advise have to bring the board to a state where I could load a new program again?

Thank in advance. 

[Mike_ST]

Hello,

Try to connect (under reset) to the board with the STM32CubeProgrammer, and to erase the MCU to check if it is the Blinking LED example that makes troubles.

[Rico1234]

STM32CubeProgramer do not detect the board.