https://devzone.nordicsemi.com/f/nordic-q-a/52149/dfuhi, I&#39;m working with NRF52832, DFU service is configured as secured. my question is : i&#39;m trying to change dfu char a ct e ristic property to &quot;ind i cation&quot; by writing to the dfu descriptor, but no &quot; EVT_GATT_ATTRIBUTE_MODIFIED&quot; event is rec ei ved. myen-USTelligent Community 13Mon, 16 Sep 2019 14:28:28 GMThttps://devzone.nordicsemi.com/thread/209875?ContentTypeID=1Mon, 16 Sep 2019 14:28:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4ba5f1d0-e4ad-4518-ac1a-eb0aa0edf796dvir<p>hi, thanks&nbsp;for the quick answer. it was&nbsp;informative and helpful.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/209749?ContentTypeID=1Mon, 16 Sep 2019 06:53:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:58cd6b8b-68d2-4594-b9e0-f3ae5f58dcbcVidar Berg<p>Hi,</p> <p>Assuming you built the application with ble_dfu_bonded.c and not ble_dfu_unbonded.c you need to either be paired or bonded with the device before you can access the butonless DFU characteristics.&nbsp;I would, however, recommend you to&nbsp;consider the &#39;unbonded&#39; variant because it&#39;s simpler. It won&#39;t affect the validation checks inside the bootlaoder.&nbsp;</p><div style="clear:both;"></div>