https://devzone.nordicsemi.com/f/nordic-q-a/37286/dfu-unknwon-command---gen-keyHi, I&#39;m testing the nrfutil tool for DFU in windows but it seems that when running nrfutil keys --gen-key private_key.txt I get &quot; no such option: --gen-key&quot; , using nrfutil keys generate private_key.txt works fine. Same thing is happening with genpkgen-USTelligent Community 13Thu, 09 Aug 2018 08:39:16 GMThttps://devzone.nordicsemi.com/thread/143508?ContentTypeID=1Thu, 09 Aug 2018 08:39:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c8aedefd-4417-4bac-9278-6856071a4a1aEinar Thorsrud<p>Hi,</p> <p>The usage of nrfutil has changed a bit over time. The current version of nrfutil is 3.5.1, and you can find a description of how to use it to generate keys under <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/lib_bootloader_dfu_keys.html?cp=4_0_0_3_5_1_3">Working with keys</a>&nbsp;in the SDK documentation. You can also use <code>nrfutil --help</code> to see all commands, and <code>nrfutil keys --help</code> to see how to use the keys command.</p><div style="clear:both;"></div>