https://devzone.nordicsemi.com/f/nordic-q-a/74229/no-pulsating-ledI&#39;m working with nRF52840 dongle, i installed nRF Connect for Desktop on windows but the led didn&#39;t start pulsing red. Has anyone else had an issue like this?en-USTelligent Community 13Thu, 22 Apr 2021 07:26:51 GMThttps://devzone.nordicsemi.com/thread/306228?ContentTypeID=1Thu, 22 Apr 2021 07:26:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ba68f6ae-5371-4ad5-b890-cc2765e51cfddjedjiga salmi<p>Yes, it is worked. Thank you so much</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/306090?ContentTypeID=1Wed, 21 Apr 2021 12:06:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f4943588-b817-48ce-8178-241e906d8f9cEinar Thorsrud<p>Hi,</p> <p>The LD2 LED on the nRF52840 Dongle pulsates read to indicate that the device is in DFU mode. As it does not pulsate red in your case, it is not in DFU mode. To put it in DFU mode, you press the sideways reset button as indicated here:</p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/6761.nRF52840_5F00_dongle_5F00_press_5F00_reset_5F00_white.png" /></p> <p>Please let me know if that does not work.</p><div style="clear:both;"></div>