STM32F4x1 note detected by MiniDebugger ST-LINK V2.1

[justinjools22]

Hi, I have been using WeActStudio.Mini STM32F11CEU6 Black MCU for several months with no errors and suddenly today I can't upload anymore.

I have been trying the ST-LINK utility to connect. It connects to STM32F103C6 Blue but not STM32F11CEU6 Black MCU. I have also tried with brand new STM32F11CEU6 and it doesn't connect either. I suspect it's something to do with the ST-LINK driver but have updated this to latest version or it's STM32Cube software but have reinstalled this as well.

[justinjools22]

I just discovered it connects if I hold the reset button down and do "Connect under reset" using ST-LINK utility.

I tried again with blink sketch on Arduino IDE and got it working:
Holding down reset button while compiling then releasing just before uploading.

Now it connects every time. I guess it resets the board.