https://devzone.nordicsemi.com/f/nordic-q-a/5472/programming-softdevice-bootloader-and-application-on-nrf51-dkHi folks, I have been successful in getting sample code compiled using Keil u-vision and MBED and installing it on nrfDK-51. It has become so simple to install apps - all you do it connect to the USB port on your computer, the board shows up as a Jen-USTelligent Community 13Tue, 09 Aug 2016 18:06:08 GMThttps://devzone.nordicsemi.com/thread/19091?ContentTypeID=1Tue, 09 Aug 2016 18:06:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:21f863da-a24a-4f4f-b095-7dd3a166be2asaiteja<p>help me:<a href="https://devzone.nordicsemi.com/question/90085/undefined-reference-to-softdevice_handler_initnrf_clock_lf_cfg_t-void-unsigned-short-unsigned-long/">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/19093?ContentTypeID=1Sat, 07 Feb 2015 12:44:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3ac81398-05db-49e8-8e74-3f53db10fb37Petter Myhre<p>Thank you for sharing.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/19092?ContentTypeID=1Fri, 06 Feb 2015 21:55:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6088a2a2-5326-4352-a550-1abb21e8057ananunh<p>The problem was my nRFGo Studio version. Older versions of nRFGo studio do not show up the Segger developement board as an option when you connect the nrf51-DK board to the USB cable of the windows PC.</p> <p>With nRFGo upgrade to version 1.17.1.3252 the board shows up and you can change the Program SoftDevice or the Program Application of the Program Bootloader. Shown below is the working copy...</p> <p><img src="http://s18.postimg.org/z3dlpuko9/2015_02_06_1647.png" alt="image description" /></p><div style="clear:both;"></div>