https://devzone.nordicsemi.com/f/nordic-q-a/13365/nrf-toolbox-dfu-upload-fails----dfu-service-not-foundI&#39;m trying to use the ble_app_hrs_s132_with_dfu_pca10040 example project with my PCA10040 nRF52 DK. Using Keil uVision 5, I&#39;m able to compile the project and flash to the board. Interrogating using LightBlue, I can see the peripheral appear as Nordic_HRMen-USTelligent Community 13Thu, 28 Apr 2016 11:27:55 GMThttps://devzone.nordicsemi.com/thread/50962?ContentTypeID=1Thu, 28 Apr 2016 11:27:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bff607ca-db97-40da-91eb-bee238a90407bjorn-spockeli<p>You have to flash both the application and the bootloader to the nRF52, and the application application must support the DFU Service. There is a guide on our Infocenter, found <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v11.0.0/bledfu_appextending.html">here</a>, showing how to add DFU Service support to an application.</p> <p>The central will send a DFU start command to the DFU service in the application, upon receiving this command, the Application will prepare the device for DFU and reset the device in Bootloader Mode. The central will then send the firmware image over the air and once the complete image is received, the bootloader will replace the application and run to the new application.</p> <p>-Bjørn</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/buttonless_5F00_dfu.JPG" alt="image description" /></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/50961?ContentTypeID=1Fri, 22 Apr 2016 21:32:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f0d4ad02-f77e-410a-b7c0-50883946a086Jason Wright<p>Hi, Based on your screenshot I tried flashing the bootloader using Master Control Panel first. Seems to be working! However, the device only appears as DfuTarg, and doesn&#39;t seem to boot the application. Using the example bootloader, how can I switch between booting to DFU mode and application?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/50960?ContentTypeID=1Wed, 20 Apr 2016 23:21:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f1bd395d-5c00-48c7-a274-c468415fe3ceWestCoastDaz<p>Jason,</p> <p>Do you have the bootloader programmed into the nRF52?</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/4331.Capture.JPG" alt="image description" /></p><div style="clear:both;"></div>