https://devzone.nordicsemi.com/f/nordic-q-a/14450/sdk11-dfu-fails-with-re-build-application-bootloader-exampleI am using a custom board with NRF51822-QFAC-R7 and Master Control panel on Android. The DFU is working with test images from SDK130. BL : examples/dfu/bootloader/hex/dfu_dual_bank_ble_s130_pca10028.hex SD: components/softdevice/s130/hex/s130_nrf51_2en-USTelligent Community 13Tue, 14 Jun 2016 09:14:38 GMThttps://devzone.nordicsemi.com/thread/55200?ContentTypeID=1Tue, 14 Jun 2016 09:14:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c16ef668-73ae-486b-b7aa-750a1f5083e5FormerMember<p>Could you try one of the &quot;default&quot; .zip files in the SDK, and check if you see the same problem?</p> <p>Could you upload your .zip file here (the one that is failing)?</p> <p>Do you have an extra nRF51-DK or a nRF51-Dongle? If so, could you use <a href="https://www.nordicsemi.com/eng/nordic/download_resource/26386/14/65517724">the sniffer</a> to track what is being transferred over the air? And upload the sniffer trace here?</p> <p>The sniffer should be used with Wireshark, and it works best with version 1.10, not one of the newer versions.</p><div style="clear:both;"></div>