https://devzone.nordicsemi.com/f/nordic-q-a/121502/unable-to-write-software-to-newly-purchased-usb-dongleI&#39;m attempting to write software onto a newly purchased nRF52840 dongle using nRF Connect for desktop, but I&#39;m unable to do so. My environment is Ubuntu 24.042 LTS. The LED is slowly blinking red, confirming that the nRF52840 dongle is in DFU mode. Ien-USTelligent Community 13Thu, 15 May 2025 13:18:01 GMThttps://devzone.nordicsemi.com/thread/535606?ContentTypeID=1Thu, 15 May 2025 13:18:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:776b514b-f2cd-42e6-b74a-4618301f9c4ePriyanka<p>Hi,</p> <p>There has been previously reported cases of no access to serial port which occured&nbsp;If your user is not in the correct group (typically dialout or plugdev). Could you maybe make sure that your user is in the dialout group:</p> <p><strong>sudo usermod -aG dialout $USER</strong></p> <p>Also, this might sound silly, but please could you try changing the cables?</p> <p>-Priyanka</p><div style="clear:both;"></div>