https://devzone.nordicsemi.com/f/nordic-q-a/34514/buttonless-dfu-example-sdk15---no-dfu-serviceHi, I have completed all steps in the example at the following link https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader and all works OK. Without modification i have compiled the Buttonles DFU applicationen-USTelligent Community 13Wed, 23 May 2018 08:05:33 GMThttps://devzone.nordicsemi.com/thread/132904?ContentTypeID=1Wed, 23 May 2018 08:05:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2a21d883-99a9-451d-a984-776c2bc43f96Vidar Berg<p>Hi,</p> <p>I&#39;m guessing your device had the LED Button service previously and&nbsp; the central has cached this, hence&nbsp;skipping service discovery on re-connect. Central is allowed to do that if the service changed characteristic is not included (enabled/disabled with NRF_SDH_BLE_SERVICE_CHANGED define in sdk_config.h). On iphone you can clear the cache by toggling flight mode enable.&nbsp;</p> <p>It is recommended to use the service changed characteristic if the device supports DFU since the attribute handles may change. More information about the service changed characteristic can be found in core spec. 5, Part G, section 2.5.2.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/132652?ContentTypeID=1Tue, 22 May 2018 07:39:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f686e93f-af5d-48ee-8010-f69ed6d2d965David Challender<p>I have found that the buttonless example worked correctly when ported to my custom development board.&nbsp;</p><div style="clear:both;"></div>