https://devzone.nordicsemi.com/f/nordic-q-a/6935/program-s120-over-keilHi I want to program the S120 softdevice over an mbed HRM1017 ([link text] that uses nrf51822. I can program only with CMSIS-DAP or drag and drop over the drive. I am using KEIl Uvision free version (32k limit). I first flashed the softdevice withen-USTelligent Community 13Thu, 07 May 2015 12:47:51 GMThttps://devzone.nordicsemi.com/thread/24457?ContentTypeID=1Thu, 07 May 2015 12:47:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5cf0ebf3-22cc-4b0a-a6d4-b094226b7963Mike<p>Really a big thank you! Now it works! It was the 32kHz crystal.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/24456?ContentTypeID=1Thu, 07 May 2015 11:39:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4a1d5cd1-7feb-44af-81d2-902a41c2bd87Hung Bui<p>@Mike: I&#39;m testing here and seeing no problem. Have you made sure you followed this instruction correctly : <a href="http://www.keil.com/support/man/docs/uv4/uv4_fl_hexdownload.htm">http://www.keil.com/support/man/docs/uv4/uv4_fl_hexdownload.htm</a> ?</p> <p>Note that the HRM1017 module doesn&#39;t have 32kHz crystal, so you need to use the 32kHz RC (NRF_CLOCK_LFCLKSRC_RC_250_PPM_250MS_CALIBRATION) when calling SOFTDEVICE_HANDLER_INIT() instead of NRF_CLOCK_LFCLKSRC_XTAL_20_PPM.</p><div style="clear:both;"></div>