https://devzone.nordicsemi.com/f/nordic-q-a/72436/dfu-buttonless-nrf52832-sd7-2-0-sdk-17-0-2---entering-dfu-modeHi All, Hardware: Custom Board (Buttonless) SDK : 17.0.2 SD: 7.2.0 Support required: DFU Buttonless We are able to successfully load and run the DFU buttonless application by following the blog https://github.com/gamnes/nRF52832-buttonlessen-USTelligent Community 13Mon, 08 Mar 2021 13:58:17 GMThttps://devzone.nordicsemi.com/thread/298410?ContentTypeID=1Mon, 08 Mar 2021 13:58:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bb2d31e1-3036-46ac-a2cf-e02e3421e60dHung Bui<p>Hi Imtiaz,&nbsp;</p> <p>The ble_app_hrs doesn&#39;t have buttonless service that&#39;s implemented in the ble_app_buttonless example. This explains why you couldn&#39;t enter DFU mode again (unless you press and hold Button 1 when resetting).</p> <p>Please refer to the code of ble_app_buttonless and add the same service into your application so that it support switching to DFU mode via BLE. I explained a little bit about buttonless DFU in<a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader#h75sjziavjbukzaywg6xlx19np0fm4"> this blog.&nbsp;</a>&nbsp;</p><div style="clear:both;"></div>