title: STM32: STLink won't connect through SWD any longer
body: <p>The first flashing went fine, subsequent flashings fail with</p>
  
  <blockquote>
    <p>Error in initializing ST-LINK device. Reason: No device found on
    target.</p>
  </blockquote>
  
  <p>On an STM32H745 NUCLEO board I have enabled the DEBUG interface and SWO pin by mistake. Is there a way to hard reset this board ?</p>