https://devzone.nordicsemi.com/f/nordic-q-a/79322/question-about-4kb-data-in-flash-after-executed-nrfjprog--f-nrf53---recover-on-nrf5340HI devzone Everytime after i executed &quot;nrfjprog -f nrf53 --recover&quot; on nrf5340 DK i see it write around 4KB data into the flash. do you know what is the meaning for this 4KB data ? The reading result on JFLASH BRen-USTelligent Community 13Mon, 06 Sep 2021 12:29:40 GMThttps://devzone.nordicsemi.com/thread/328199?ContentTypeID=1Mon, 06 Sep 2021 12:29:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:028acfe0-098e-4b26-8646-9569bebd3b7cMarjeris Romero<p>Hi David,</p> <p>The --recover command erases the flash memory and then writes a small binary into the recovered flash memory. This binary prevents the readback protection from enabling itself again after a pin reset or power cycle.</p> <p>See <a href="http://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrf/ug_nrf5340.html#readback-protection">http://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.6.1/nrf/ug_nrf5340.html#readback-protection</a> <br /><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1630931363925v1.png" alt=" " /></p> <p>Best regards,</p> <p>Marjeris</p><div style="clear:both;"></div>