https://devzone.nordicsemi.com/f/nordic-q-a/76712/dfuHi, i am working on dfu with nrf52dk. i am facing a problem when genrating private key. in cmd i got error with following command &quot;C:\Users\admin\Desktop\a&gt;nrfutil.exe keys generate private.key Traceback (most recent call last): File &quot;c:\users\adminen-USTelligent Community 13Thu, 24 Jun 2021 12:29:11 GMThttps://devzone.nordicsemi.com/thread/316986?ContentTypeID=1Thu, 24 Jun 2021 12:29:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ffda6d1b-a465-419b-8ca2-f657c921333eAmanda Hsieh<p>Hi,&nbsp;</p> <p><span><span>There is <a href="https://devzone.nordicsemi.com/f/nordic-q-a/65889/nrfutil-modulenotfounderror-no-module-named-constants/286320#286320">a known issue</a> with python 3.9.&nbsp;Can you try&nbsp;Python 3.7?</span></span></p> <p><span><span>-Amanda H.</span></span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/316972?ContentTypeID=1Thu, 24 Jun 2021 12:03:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b0223d69-358b-4294-afb0-35bbe81b7a97harrys<p>yes i installed with &quot;<code>pip install -U nrfutil</code><span>&quot;</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/316962?ContentTypeID=1Thu, 24 Jun 2021 11:44:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8d94647f-8eca-427f-884f-b312532248d0Einar Thorsrud<p>Hi,</p> <p>How did you install nrfutil? I recomend installing using pip, so that you get all dependencies: &quot;<code>pip install -U nrfutil</code>&quot;</p><div style="clear:both;"></div>