https://devzone.nordicsemi.com/f/nordic-q-a/21531/secure-dfu---issue-in-updating-the-applicationHello, I am trying to implement OTA firmware update using Secure DFU. SDK - 12.2 Softdevice - s132 Board - PCA10040 (nRF52) I followed instructions mentioned here Issues: Once the bootloader code has been uploaded, device advertisesen-USTelligent Community 13Fri, 21 Apr 2017 13:00:17 GMThttps://devzone.nordicsemi.com/thread/84530?ContentTypeID=1Fri, 21 Apr 2017 13:00:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fdaef450-8cb1-4a19-a03b-0df50ecf3babRishi<p>The answer is pretty simple and the issue was due to my carelessness.</p> <p>The link discusses secure DFU using s132 v4.0.2. Thus --sd-req is 0x98.</p> <p>Since, I am using s132 v3.0.0, --sd-req should be 0x8C.</p><div style="clear:both;"></div>