https://devzone.nordicsemi.com/f/nordic-q-a/13234/can-t-erase-bootloaderHi, I&#39;m trying to debug my program after trying out the DFU example (specifically dfu/bootloader/pca10040/dual_bank_serial_s132). Using my Segger J-Link, I run &#39;erase&#39;. Then I power-cycle the chip, actually pulling out and plugging in the poweren-USTelligent Community 13Mon, 18 Apr 2016 09:30:35 GMThttps://devzone.nordicsemi.com/thread/50464?ContentTypeID=1Mon, 18 Apr 2016 09:30:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:19a17fd1-6c21-40d2-911e-534ae4d0022ebjorn-spockeli<p>I suggest using our command line tool <code>nrfjprog</code> to flash and erase our devices.</p> <p>To erase the entire flash and UICR registers on a nRF5x Series chip you can use the following command:</p> <pre><code>nrfjprog --eraseall </code></pre> <p>-Bjørn</p><div style="clear:both;"></div>