https://devzone.nordicsemi.com/f/nordic-q-a/51089/nrfjprog-10-3-0-segfaultRunning nrfjprog 10.3.0 on macOS 10.14.6 (18G87) with an nRF52 dev kit Occurs on all 10.x releases of Nordic command line tools. Other switches such as -i work. edit: actually, this is occurring even on 9.x versions. Something must have changeden-USTelligent Community 13Fri, 16 Aug 2019 17:47:54 GMThttps://devzone.nordicsemi.com/thread/204566?ContentTypeID=1Fri, 16 Aug 2019 17:47:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9458f693-9dc7-48d5-bd1a-773daf5d843bnrbrook<p>I had pin 21 connected to ground. I guess this was causing infinite reboot. It probably shouldn&#39;t cause a segfault in nrfjprog, but I&#39;ve solved this issue.</p><div style="clear:both;"></div>