Differences eraseall and recoverhttps://devzone.nordicsemi.com/f/nordic-q-a/109614/differences-eraseall-and-recoverHello Team, I am wondering if the nrfjprog can erase all the flash and UICR by --recover option. For this question, I just read the below links but, I couldn&#39;t get the conclusion still. If I execute &quot;--eraseall&quot; and &quot;--recover&quot; separatelyen-USTelligent Community 13Mon, 25 Mar 2024 06:45:49 GMTRE: Differences eraseall and recoverhttps://devzone.nordicsemi.com/thread/475527?ContentTypeID=1Mon, 25 Mar 2024 06:45:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0e8b7f97-6e63-49bb-99f8-63d8ff5131f7Eugene Yu<p>Hi Vidar,</p> <p>Thanks for your clear and prompt answer. <span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span></p> <p></p> <p>Thanks,</p> <p>Eugene</p><div style="clear:both;"></div>RE: Differences eraseall and recoverhttps://devzone.nordicsemi.com/thread/475526?ContentTypeID=1Mon, 25 Mar 2024 06:31:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fedd76c1-523f-4d1b-bcfa-cde9a9ea9033Vidar Berg<p>Hello <span>Eugene</span>,</p> <p>The nrfjprog --recover command will first perform an &#39;<a title="Erase all" href="https://infocenter.nordicsemi.com/topic/ps_nrf5340/ctrl-ap.html?cp=4_0_0_7_9_1#ctrlap_erase">Erase all</a><span>&nbsp;</span>&#39; operation through the CTRL-AP before it writes 0x50FA50FA to UICR.<a title="APPROTECT" href="https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/uicr/doc/uicr.html?cp=4_0_0_4_3_2_0_0#register.APPROTECT">APPROTECT</a><span>&nbsp;</span>to disable APPROTECT in hardware. Then, it loads a small firmware that will disable APPROTECT in software.</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1711347183734v1.png" alt=" " /></p> <p><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/device_guides/working_with_nrf/nrf53/nrf5340.html#readback-protection">https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/device_guides/working_with_nrf/nrf53/nrf5340.html#readback-protection</a></p> [quote user=""]It seems to verify only the application core.[/quote] <p>It&#39;s verifying both cores when I test it here.</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>