https://devzone.nordicsemi.com/f/nordic-q-a/42449/dfu-character-not-founddear i am using this proj to get dfu functional nRF5_SDK_14.2.0_17b948a\nRF5_SDK_14.2.0_17b948a\examples\ble_peripheral\ble_app_uart\main.c i add some code in main.c : #ifdef DFU_SUPPORT ble_dfu_buttonless_init_t dfus_init = {0}; // Initializeen-USTelligent Community 13Mon, 14 Jan 2019 11:17:34 GMThttps://devzone.nordicsemi.com/thread/165408?ContentTypeID=1Mon, 14 Jan 2019 11:17:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:78d66bbc-ff10-4402-bb6b-ef2612fd6117AndreasF<p>Hi.</p> <p>Please don&#39;t try to test everything at once.</p> <p>Please confirm if you setup passes the following test:</p> <ol> <li>Test bootloader, DFU upload a normal application, such as ble_app_hrs . Test only the bootloader, don&#39;t do merge application or flash bootloader setting.</li> <li>Test the buttonless DFU application + bootloader. Make sure you can do DFU from the application so that the application automatic switch to bootloader and then do DFU.</li> <li>Use BLE master tool, such as the nRF Connect to open your combined buttonless DFU and your application ( ble_app_uart), make sure you see the 2 services. Make sure you have increased NRF_SDH_BLE_VS_UUID_COUNT to match with number of 128 bit base UUID you define.</li> </ol> <p>Best regards,</p> <p>Andreas</p><div style="clear:both;"></div>