https://devzone.nordicsemi.com/f/nordic-q-a/30840/dfu-for-ble-beacon-using-nrf51822-with-sdk-12-3I need to develop a beacon application with the OTA DFU capabilities (Buttonless). I have the NRF51-DK. As a starting point, I tried the bootloader example located in the \nRF5_SDK_12.3.0_d7731ad\examples\dfu directory to do a secure DFU( with buttonen-USTelligent Community 13Wed, 28 Feb 2018 14:48:34 GMThttps://devzone.nordicsemi.com/thread/122326?ContentTypeID=1Wed, 28 Feb 2018 14:48:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bdfad0aa-d35d-455c-b445-0ef1c75e8fb6Bj&#248;rn Kvaale<p><a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/ble_sdk_app_buttonless_dfu.html?cp=4_0_5_4_3_2" rel="noopener noreferrer" target="_blank">As the documentation shows</a>, you are correct that you should write 0x01 to the DFU control point characteristic. It should work with both nrf connect for mobile &amp; nrf toolbox? Have you tried with nrf toolbox yet? I believe the beacon will need to be in connectable mode to be able to write the 0x01 to the DFU control point characteristic.&nbsp;The beacon app can be added just like in step C1 of the <a href="https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader" rel="noopener noreferrer" target="_blank">secure dfu blog post</a>. You will not need to build the beacon app on top of the buttonless dfu bootloader template.&nbsp;</p> <p>As <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.3.0/ble_sdk_app_beacon.html?cp=4_0_5_4_2_2_2" rel="noopener noreferrer" target="_blank">this link</a> states: &quot;the&nbsp;<span>beacon is advertising with its&nbsp;</span><em>Bluetooth</em><span>device address without a Device Name</span>&quot;. Hope that helps!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/121953?ContentTypeID=1Mon, 26 Feb 2018 12:37:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:11990ea7-be89-4e8c-b3b4-f14d5042e611michel21033<p>I have successfully tested the secure dfu with the use of the button. However I&#39;m not able to get it working without the button. I compiled the experimental buttonless dfu template app and uploaded via secure dfu mentioned above. I am using the nrf connect android app and I am able to see the dk advertising as buttonless dfu template. How do I then put the device in boot loader mode.? The documentation says to write 0x01 ? Can someone point me in the right direction?</p> <p>In my final application, in order to have buttonless dfu, should the beacon be in connectable mode?</p> <p>Should I build the beacon app on top of the template?</p> <p>What would be the advertised id? I am planning to make the beacon packet ibeacon compatible.</p><div style="clear:both;"></div>