https://devzone.nordicsemi.com/f/nordic-q-a/47626/trouble-with-transition-to-gccSDK 12.3 nrf51 DK ARMGCC Windows 10 I&#39;m trying to switch to gcc. I use 4.9 2015q3 version as recommended. I have a trouble with simple blank blinky project (nRF5_SDK_12.3.0_d7731ad\examples\peripheral\blinky\pca10028\blank\armgcc). I makeen-USTelligent Community 13Wed, 22 May 2019 11:02:13 GMThttps://devzone.nordicsemi.com/thread/188518?ContentTypeID=1Wed, 22 May 2019 11:02:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f3991067-b6f3-4716-90d7-dcdadce84b49bjorn-spockeli<p>HI ArtG89,&nbsp;</p> <p>I flashed the attached hex file( nrf51422_xxac.hex) to a nRF51 DK(PCA10028) using nrfjprog and it worked fine on my end.&nbsp;</p> <p>I used the following nrfjprog command:</p> <p><pre class="ui-code" data-mode="text">nrfjprog -f nrf51 --program nrf51422_xxac.hex --chiperase --reset</pre></p> <p>which gave the following output</p> <p><br />Parsing hex file.<br />Erasing user available code and UICR flash areas.<br />Applying system reset.<br />Checking that the area to write is not protected.<br />Programming device.<br />Applying system reset.<br />Run.</p> <p>and LED1-3 is blinking.&nbsp;</p> <p>Best regards</p> <p>Bj&oslash;rn&nbsp;</p><div style="clear:both;"></div>