Add OTA DFU on my previous nRF51 PCB.https://devzone.nordicsemi.com/f/nordic-q-a/13056/add-ota-dfu-on-my-previous-nrf51-pcbHi, I&#39;m originally iOS app developer. I have been developing with custom PCB that based on nRF51 chip. (not nordic development kit) My PCB has a gyro sensor and some other sensors. And It&#39;s working and syncing with my iOS app. (it&#39;s like smart banden-USTelligent Community 13Mon, 11 Apr 2016 12:13:39 GMTRE: Add OTA DFU on my previous nRF51 PCB.https://devzone.nordicsemi.com/thread/49764?ContentTypeID=1Mon, 11 Apr 2016 12:13:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0c0e8495-9680-412f-b63d-bece8137aceebjorn-spockeli<ol> <li>Yes, you can update just the application using our OTA DFU bootloader, but it is also possible to update the SoftDevice and the Bootloader if you want to do that.</li> <li>Yes, the <a href="https://developer.nordicsemi.com/nRF5_SDK/nRF51_SDK_v8.x.x/doc/8.0.0/s110/html/a00081.html">Extending your Application</a> section explains how to add DFU support to an application, so just follow the steps.</li> </ol> <p>-Bjørn</p><div style="clear:both;"></div>