nrfjprog cannot connects to PCA10056https://devzone.nordicsemi.com/f/nordic-q-a/55342/nrfjprog-cannot-connects-to-pca10056nrfjprog is reporting &quot;Cannot connect to J-Link.&quot; while trying to erase on MacOS Catalina Board used to work properly, but attempting to re-connect after a wipe of my MacBook. Log.log is attached. Is there some compatibility issue with Catalina oren-USTelligent Community 13Mon, 09 Dec 2019 13:30:10 GMTRE: nrfjprog cannot connects to PCA10056https://devzone.nordicsemi.com/thread/224460?ContentTypeID=1Mon, 09 Dec 2019 13:30:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae39e5b4-1025-48b5-bf51-fb9ced41013aKen<p>Solution:<br />Do not have a sagger debugger attached while trying to interface to the Dev Board.<br />nrfjprog cannot determine which sagger is the Nordic Board &amp; which is the other board.<br />Once I removed the second debugger, everything worked fine.</p><div style="clear:both;"></div>