https://devzone.nordicsemi.com/f/nordic-q-a/32728/nrf-connectwhat is the problem of &quot;ERROR Failed to open nrfjprog: Error occured when open device long term. Errorcode: CouldNotLoadDLL (0x3)&quot; , when i use the nRF Connect. the version of nRF Connect is 2.1 and the and use nRF52840_PDK_. Thanksen-USTelligent Community 13Mon, 26 Mar 2018 12:49:49 GMThttps://devzone.nordicsemi.com/thread/125955?ContentTypeID=1Mon, 26 Mar 2018 12:49:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:38628494-f597-4543-80ee-f2d3dadb7bdftesc<p>Hi,</p> <p>Looks like problems with loading the J-Link dll, which is used for communicating with the programmer MCU on the DK.</p> <p>Please make sure to install the latest version of both nRF Connect (currently v2.3.0), the nRF Connect Bluetooth Low Energy app (inside nRF Connect, currently v2.1.0), and also the latest version of <a href="https://www.segger.com/downloads/jlink/">J-Link Software and Documentation Pack</a> from SEGGER (currently v6.30i).</p> <p>If the problem persists, please share the results of running the command &quot;<code>nrfjprog --version</code>&quot; from a command line.</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>