Hello, currently I'm trying to getting started with the Nucleo board and Embedded Studio. Therefor I installed the J-Link firmware on my Nucleo board. As far as I can tell the board is recognized as J-Link. Then I wrote a small blinky program trying to set Pin PC10 as output: Source Code (12 lines) For starting the program I hit F5. The pin shows no action, but I can tell that the uC is running because when I set a breakpoint on the koop it get's hit.