https://devzone.nordicsemi.com/f/nordic-q-a/73474/mergehex-failedI am using nrfutil version 5.2.0 with Python27. I attempted to build several times and I got the same error. Please let me know what is &quot; mergehex failed for an unknown reason &quot; and &quot; Error 50&quot; mean. The below trace has the additional information. en-USTelligent Community 13Thu, 15 Apr 2021 22:44:50 GMThttps://devzone.nordicsemi.com/thread/305182?ContentTypeID=1Thu, 15 Apr 2021 22:44:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:92023584-07df-43a4-aa1d-788821005574mchartier<p>Same problem here, except I&#39;m running on MacOS. Downgrading to 9.8.0 worked for me as well.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/302816?ContentTypeID=1Wed, 31 Mar 2021 20:01:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:130fb519-e191-4d59-bc89-df6a5d255f7cgfgf2400<p>I switched back to&nbsp;<span>nRF-Command-Line-Tools 9.8.0 and the problem went away.</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/302814?ContentTypeID=1Wed, 31 Mar 2021 19:34:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0e51818-f008-4931-92fb-a2b51d1d0f92gfgf2400<p>I am using nRF-Command-Line-Tools 10.12.1 x64</p><div style="clear:both;"></div>