https://devzone.nordicsemi.com/f/nordic-q-a/10122/why-i-couldn-t-wirte-rbpconf-register-via-jlinkexeI found I couln&#39;t write RBPCONF register via JLinkExe on Mac (everytime i wrote the value just remains) but only through nrfgo with option &quot;Lock entire chip from readback&quot; selected on PC. I conjecture it&#39;s on the concern of security. But I&#39;m just curiousen-USTelligent Community 13Sat, 07 Nov 2015 05:08:44 GMThttps://devzone.nordicsemi.com/thread/37545?ContentTypeID=1Sat, 07 Nov 2015 05:08:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:499adc14-40a8-49e8-9b95-237361da81fbjoc<p>Thanks for your answer!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/37544?ContentTypeID=1Sat, 07 Nov 2015 05:03:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:11468e44-c056-4c30-a798-c859ff73f092RK<p>Yes that&#39;s the whole point of readback protection. If you were able to un-set it again, it wouldn&#39;t be protected. You have to erase the whole chip to remove it. This is all in the manual.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/37543?ContentTypeID=1Sat, 07 Nov 2015 05:02:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:17e3d319-16ff-4be4-b011-c94a9a34b564joc<p>Yes, after I write config register with write enabled, I could write the RBPCONF register! Thanks for your help! But I couldn&#39;t write RBPCONF agiain meaning unlock the readback protection after the first write, is it reasonable ?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/37542?ContentTypeID=1Sat, 07 Nov 2015 01:27:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:24bb2693-dda5-4734-b9a5-562564c55c98RK<p>Did you enable writing to flash before trying to write the RBPCONF value? Try that.</p><div style="clear:both;"></div>