https://devzone.nordicsemi.com/f/nordic-q-a/30617/flashing-using-nrf-51dkI wanted to upload a code to a control box which has a nrf51 series microcontroller. I am wondering can I use NRF51DK to program it? But I didnt see any ISP socket on NRF 51 DK ? Can I program/Flash a hex file to the control box using NRF 51DK ? If yesen-USTelligent Community 13Sun, 18 Feb 2018 02:19:23 GMThttps://devzone.nordicsemi.com/thread/121166?ContentTypeID=1Sun, 18 Feb 2018 02:19:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0de8fcb5-db54-4954-898e-9c4721df3c29Matt<p>If you are using the PCA10028 nRF51 DK then you should find the 8-pin header to the right of the 2-pin&nbsp; &quot;nRF current measurement&quot;. The vtg, swdclk, swdio and gnddetect pins are the ones that you use to program the nRF51 in your control box. But do you know if the corresponding swd pins on the target nRF51 (the one in control box) are exposed for programming purpose? For the exact wiring you need to search in this forum...&nbsp;</p><div style="clear:both;"></div>