https://devzone.nordicsemi.com/f/nordic-q-a/65027/not-able-to-flash-signed-firmware-through-pc-nrf-dfu-js-nodejs-libraryWe&#39;re building a cryptocurrency hardware wallet. And we&#39;re using the secure bootloader provided by nrf5 SDK, to only upload signed firmwares to the device. We are using nodejs to build all our applications, so we&#39;re using the pc-nrf-dfu-js nodejs libraryen-USTelligent Community 13Fri, 21 Aug 2020 13:51:30 GMThttps://devzone.nordicsemi.com/thread/265795?ContentTypeID=1Fri, 21 Aug 2020 13:51:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:16618ac1-0524-4bb5-961f-d8269a9e4fe8Hakon<p>Hey,</p> <p>is your device using serial DFU or BLE OTA DFU? If it is using the latter, you should use the <a href="https://github.com/NordicSemiconductor/pc-ble-driver-js">pc-ble-driver-js</a> library instead. Can you also provide logs from the device and host?</p><div style="clear:both;"></div>