https://devzone.nordicsemi.com/f/nordic-q-a/69423/nrf52840-and-st-link-v2Hello I have a cheap ST-link that I use heavylly to program STM arm cortex chip. So my guess is that it should work for this case. I am following this tutorial: https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/flashing-the-bootloaderen-USTelligent Community 13Sun, 13 Dec 2020 10:46:20 GMThttps://devzone.nordicsemi.com/thread/284645?ContentTypeID=1Sun, 13 Dec 2020 10:46:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:409bf563-950f-43a4-b701-6b7093ca99f2Baraneb42<p>Hi,</p> <p>I successfully flashed the bootloader with openOCD.</p> <p>I followed that tutorial.</p> <p><a href="https://www.youtube.com/watch?v=R5wub5ywzTU&amp;t=197s">https://www.youtube.com/watch?v=R5wub5ywzTU&amp;t=197s</a></p> <p>/Eric</p><div style="clear:both;"></div>