This is a question about Bluetooth dfu.https://devzone.nordicsemi.com/f/nordic-q-a/115826/this-is-a-question-about-bluetooth-dfuHello. I am experimenting with the nRF52-DK board. The tool is segger studio on win x64. Bluetooth appears on the smartphone and disappears after a while. It is not connecting or connecting. I have been stuck here for a week. I don&#39;t know what is wrongen-USTelligent Community 13Fri, 25 Oct 2024 12:30:01 GMTRE: This is a question about Bluetooth dfu.https://devzone.nordicsemi.com/thread/507934?ContentTypeID=1Fri, 25 Oct 2024 12:30:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:69c4f076-b103-436e-bac7-51640b5e946dMenon<p>Hello,</p> <p>Thank you for confirming the SDK and version. Have you followed all the steps in the guide I mentioned? Please also take a look at <a href="https://docs.nordicsemi.com/bundle/sdk_nrf5_v17.1.0/page/ble_sdk_app_buttonless_dfu.html">this sample application</a>. Check the<a href="https://docs.nordicsemi.com/bundle/sdk_nrf5_v17.1.0/page/ble_sdk_app_buttonless_dfu.html#:~:text=examples%5Cble_peripheral%5Cble_app_buttonless_dfu-,Testing,-Testing%20is%20done"> testing section</a> to see if you can perform a buttonless DFU.</p> <p>I recommend providing more details about the issue you’re facing, such as logs or error messages.</p> <p>Kind Regards,<br />Abhijith</p><div style="clear:both;"></div>RE: This is a question about Bluetooth dfu.https://devzone.nordicsemi.com/thread/507903?ContentTypeID=1Fri, 25 Oct 2024 11:08:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3be6419d-a883-4f74-9e4d-753bc56f479fsunghun<p>nRF5_SDK_17.1.0_ddde560 . I am using this sdk.</p> <p>I am using this sdk.<br />I am stuck on dfu update all day today.<br />Please help.</p> <div id="__endic_crx__"> <div class="css-diqpy0"></div> </div><div style="clear:both;"></div>RE: This is a question about Bluetooth dfu.https://devzone.nordicsemi.com/thread/507897?ContentTypeID=1Fri, 25 Oct 2024 10:41:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:273526a1-9a64-49a3-85cd-0f5ff5c9f3d7Menon<p>Hello,</p> <p>Could you tell me which SDK version you are using? From your explanation, I assume you are working with our older nRF5 SDK. If that&#39;s the case,<a href="https://devzone.nordicsemi.com/guides/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader#h75sjziavjbukzaywg6xlx19np0fm4"> please follow this guide on Buttonless DFU.</a></p> <p>I strongly recommend switching to our new SDK, as the old one is in maintenance mode.</p> <p>Kind Regards,</p> <p>Abhijith</p><div style="clear:both;"></div>