https://devzone.nordicsemi.com/f/nordic-q-a/61162/nrf51-dongle-not-show-up-when-connected-to-pc-when-press-the-reset-button-it-only-shows-the-boot-loaderHi, I try to use nrf51 dougle as a sniffer. My nrf51 dongle not show up when connected to PC, when press the reset button, it only shows the boot-loader. I try to find &quot;nRF5x-OB-JLink-IF&quot; file, but I can&#39;t find it, I try to install &quot;J-Link OB-SAM3U128en-USTelligent Community 13Thu, 14 May 2020 17:49:19 GMThttps://devzone.nordicsemi.com/thread/250040?ContentTypeID=1Thu, 14 May 2020 17:49:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:83bd3a95-981a-437d-9f85-4ad4e5dc37b4junp<p>Hi Huang Bui,&nbsp;</p> <p>Thanks a lots, it should work.&nbsp;</p> <p>Regards,&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/249391?ContentTypeID=1Tue, 12 May 2020 09:39:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c07501be-cebf-4920-a9db-02fdb58f6c34Hung Bui<p>Hi Junp,&nbsp;</p> <p>Could you take a screen shot of your bootloader drive ?</p> <p>I tested using the .bin file here:&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/41192/where-to-download-j-link-ob-firmware-j-link-ob-sam3u128-v2-nordicsemi-170213-bin">https://devzone.nordicsemi.com/f/nordic-q-a/41192/where-to-download-j-link-ob-firmware-j-link-ob-sam3u128-v2-nordicsemi-170213-bin</a>&nbsp;and it worked for me.</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-801478265779418a8e607fe677a67ba3/pastedimage1589276340477v1.png" alt=" " /></p><div style="clear:both;"></div>