https://devzone.nordicsemi.com/f/nordic-q-a/14794/nrf51822-mkit--connecting-to-j-link-via-usb-failed-way-to-resolveI&#39;ve connected my nRF51822 mKit to my Linux system via a USB cable. While trying to upload code on the board, I got the following error: SEGGER J-Link Commander V5.12g (Compiled May 27 2016 17:03:43) DLL version V5.12g, compiled May 27 2016 17:03en-USTelligent Community 13Tue, 28 Jun 2016 09:09:39 GMThttps://devzone.nordicsemi.com/thread/56480?ContentTypeID=1Tue, 28 Jun 2016 09:09:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4142a116-aa45-41fc-93eb-e90afe966b28Anders Strand<p>Hi.</p> <p>The mKit board has the mBed Standard <a href="http://www.keil.com/support/man/docs/dapdebug/dapdebug_introduction.htm">CMSIS-DAP</a> firmware programmed on the on-board debugger chip. You must therefore use programming software on your pc that support CMSIS-DAP. One example is the <a href="http://openocd.org/">OpenOCD</a> software. If you have a windows machine available, ARM&#39;s Keil software also supports CMSIS-DAP.</p> <p>Does the board mount itself as a mass storage device in your system? Then you can drag&#39;n&#39;drop hex files to it directly. This is the normal method with mBed compiled hex files.</p> <p>How are you compiling the hex files you wish to flash to the board?</p><div style="clear:both;"></div>