https://devzone.nordicsemi.com/f/nordic-q-a/21616/nrf51822-yunjia-boardHello everyone, After days of struggle with the yunjia board it seems that I cannot download any program to it. I tried falsely to download program for the PCA 10028 but it seems that it&#39;s a quite different board. My question is what nrfSDK and whaten-USTelligent Community 13Tue, 25 Apr 2017 11:28:18 GMThttps://devzone.nordicsemi.com/thread/84857?ContentTypeID=1Tue, 25 Apr 2017 11:28:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc090054-2663-4c36-a18f-0574b710dbcbWojtek<p>nrf51422 will work ok, you can use it.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/84856?ContentTypeID=1Tue, 25 Apr 2017 11:25:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bd524e69-68bd-4511-8c58-2c2867361c7anormanfust<p>Thank for the reply, I&#39; ve read the symbols on the chip and found out it is a rev 3. So according to the table it means thaat I can use the SDK 12.x.0 along with SD 130. But when I go to directory nRF5_SDK_12.2.0_f012efa\examples\peripheral\blinky I got only versions for the nrf51422 and nrf52840 boards. Should I change the CFLAGS in makefile to match nrf51822 to make it work?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/84855?ContentTypeID=1Tue, 25 Apr 2017 08:45:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0e211abc-f323-426f-8b56-4f6c6f238da4Wojtek<p>We don&#39;t know what chip you got on the board. First, identify the chip revision basing on <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51/dita/nrf51/compatibility_matrix/nRF51822_ic_revision_overview.html?cp=3_0_1">this</a> table, and then use SDK and SD like it is described <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51/dita/nrf51/compatibility_matrix/nRF51422_nRF51822_ic_rev_sdk_sd_comp_matrix.html?cp=3_0_4">here</a>.</p><div style="clear:both;"></div>