https://devzone.nordicsemi.com/f/nordic-q-a/39695/nrf52840-dongle-didn-t-display-after-writing-firmwareHi! I used nRF Connect Programmer (desktop version) for writing firmware connectivity_1.2.3_115k2_with_s132_3.1.hex. And nRF52840 dongle doesn&#39;t display in the device list after that. There is no device nRF52, no COM port in the Windows Device Manageren-USTelligent Community 13Mon, 22 Oct 2018 11:41:39 GMThttps://devzone.nordicsemi.com/thread/153783?ContentTypeID=1Mon, 22 Oct 2018 11:41:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d8dd4d7b-2304-433c-b7ad-99d994e25190Vidar Berg<p>Hi,</p> <p>You need to use the usb version (<a href="https://github.com/NordicSemiconductor/pc-ble-driver/blob/release/v2.3.2/hex/sd_api_v3/connectivity_1.2.3_usb_with_s132_3.1.hex">link</a>).&nbsp;<span>connectivity_1.2.3_115k2_with_s132_3.1.hex use the UART interface which is why it doesn&#39;t show in the device manager. Press the reset button on the dongle while it&#39;s plugged in to enter DFU mode, then upload the new connectivity FW with the Programmer app.&nbsp;</span></p><div style="clear:both;"></div>