https://devzone.nordicsemi.com/f/nordic-q-a/14165/code-compatibility-issues-with-nrf51822-and-nrf51422Hi all, I am facing a weird issue trying to achieve DFU over the air with the dual-blank DFU. I had integrated DFU with my application(Background story here .) The application hex file, app.hex was merged with s110 softdevice.hex, dual blank bootloaderen-USTelligent Community 13Mon, 30 May 2016 07:10:09 GMThttps://devzone.nordicsemi.com/thread/54116?ContentTypeID=1Mon, 30 May 2016 07:10:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:205f845d-96dd-426f-86bd-390b6473bb6eMartinBL<p>Thanks for sharing!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/54115?ContentTypeID=1Sun, 29 May 2016 12:05:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fc4760e7-923f-44a8-aaea-bba07aef7d89dev_000<p>Hi guys,</p> <p>Figured out the issue. The problem was that my custom module did not have the external 32.768KHz crystal.</p> <p>So in the dual bank s110 project you need to change</p> <pre><code>SOFTDEVICE_HANDLER_APPSH_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM, true); </code></pre> <p>to</p> <pre><code>SOFTDEVICE_HANDLER_APPSH_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_TEMP_4000MS_CALIBRATION, true); </code></pre> <p>as mentioned <a href="https://devzone.nordicsemi.com/question/55732/dfu-clock-and-custom-made-board/">here</a> and <a href="https://devzone.nordicsemi.com/question/44976/dfu-bootloader-custom-board/">here</a>.</p> <p>I had wrongly changed it to</p> <pre><code>SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION, NULL); </code></pre> <p>as I had changed in my main application file.</p><div style="clear:both;"></div>