https://devzone.nordicsemi.com/f/nordic-q-a/39630/windows-command-line-dfu-over-ble-with-pca10059Hi, I can make a DFU over BLE with nRF connect 2.5.0 Bluetooth Low Energy, all is OK. I use my nRF52840-Dongle PCA10059 (Serial port: COM19 | USB: Nordic Semiconductor nRF52 Connectivity) Now, I want to make the same with nrfutil command line tool: (v4en-USTelligent Community 13Mon, 22 Oct 2018 09:58:54 GMThttps://devzone.nordicsemi.com/thread/153767?ContentTypeID=1Mon, 22 Oct 2018 09:58:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8572b9a9-f0ee-433b-ad99-7ee85e0d8d2aGa&#233;tan<p>Thanks, it&#39;s OK when remove -f option.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/153749?ContentTypeID=1Mon, 22 Oct 2018 07:58:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fb73d223-c7f3-47bd-a5d3-be816b21401cSigurd<p>Hi,</p> <p>Try to remove the -f option.&nbsp;<span>The&nbsp;</span><code>-f</code><span>&nbsp;option instructs nrfutil to actually program the board connected to COM19 with the connectivity software required to operate as a serialized SoftDevice. But the connectivity FW is already programmed to the dongle, so we don&#39;t need to do that.</span></p> <p><span>If you get error code:3, then close nRF Connect app, and plug the dongle out and in again from the computer.</span></p><div style="clear:both;"></div>