https://devzone.nordicsemi.com/f/nordic-q-a/80935/ble-nus-and-secure-bootloaderHello, I&#39;m using the secure bootloader example (examples/dfu/secure_bootloader/pca10056_s140_ble, from SDK 17.1), and would like to enter the bootloader from my application, which uses the Nordic UART Service. I&#39;m looking for a way to enter the bootloaderen-USTelligent Community 13Fri, 22 Oct 2021 11:01:32 GMThttps://devzone.nordicsemi.com/thread/335459?ContentTypeID=1Fri, 22 Oct 2021 11:01:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a3b9504e-4595-466d-9ba6-7fdfae53869aSigurd<p>Hi,</p> <p>Try using the SD API instead. Snippet:</p> <p><pre class="ui-code" data-mode="text">err_code = sd_power_gpregret_set(0, BOOTLOADER_DFU_START); APP_ERROR_CHECK(err_code);</pre></p><div style="clear:both;"></div>