Hello @QuangIoT
First let me thank you for posting.
Here are some potential solutions:
Check Connections:
Ensure that all connections between the ST-LINK and the NUCLEO board are secure and correct. Verify that the SWD pins are properly connected.
Reset Procedure:
Hold down the RESET button on the NUCLEO board while clicking the "Connect" button in STM32CubeProgrammer. Release the RESET button once connected.
Power Supply Verification:
Check that your NUCLEO board is powered correctly. Measure the voltage at the power pins to ensure they are receiving sufficient voltage (typically 3.3V).
Use STM32CubeProgrammer:
Connect to the MCU in "Under Reset" mode using STM32CubeProgrammer, which allows you to communicate with the device even if it is in a non-responsive state. Perform a full chip erase if you can connect successfully.
Firmware Update:
Make sure both your ST-LINK firmware and NUCLEO board firmware are up-to-date. You can update ST-LINK firmware using STM32CubeProgrammer.
Isolation from Other Connections:
If your NUCLEO board is connected to other hardware (like breadboards), try isolating it from those connections to prevent interference.
Replace Hardware:
If all else fails, consider that there may be a hardware fault with either your NUCLEO board or its MCU, and replacing it might be necessary.
Please check those POST1 and POST2
