https://devzone.nordicsemi.com/f/nordic-q-a/53259/unable-to-program-nrf52840-dkHi, I am new to nrf52840 DK , when I try to program it through nrf connect &quot; Unsupported device. The detected device could not be recognized as neither JLink device nor Nordic USB device.&quot; will appear. But I can see the DK as JLink driver in deviceen-USTelligent Community 13Wed, 16 Oct 2019 11:12:17 GMThttps://devzone.nordicsemi.com/thread/215258?ContentTypeID=1Wed, 16 Oct 2019 11:12:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:15e8e587-560a-4b17-b5f1-f08aef276047Kenneth<p>From the screenshot you sent I can barely see that it says nRF52840_XXAA_ENGA. This must mean you are using a very early nRF52840 preview DK, which is not recommended for development. _ENGA means it&#39;s possible an early engineering sample which differ from the production version. I highly recommend to get a new nRF52840-DK for development.</p> <p>It also looks like you are using old version of nRF Connect:</p> <p><a href="https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Connect-for-desktop/Download#infotabs">https://www.nordicsemi.com/Software-and-Tools/Development-Tools/nRF-Connect-for-desktop/Download#infotabs</a>&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/215119?ContentTypeID=1Tue, 15 Oct 2019 14:13:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d0e777b9-63c6-48df-baa6-e9b3f9ccac36karoun<p>I&nbsp;do not receive the error any more and I can see DK as driver in windows file explorer but writing on boad is not allowed on nrfConnect.</p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/0804.devzone.PNG" /></p><div style="clear:both;"></div>