https://devzone.nordicsemi.com/f/nordic-q-a/47445/vtg-pin-on-nrf51-dk-seems-to-send-the-device-into-recovery-urgentI have been trying to flash my nrf51822 by waveshare using my nrf 51 DK. I have been making the following connection. I am currently using P20 as the needle adapter for P19 is not availailbe in the market. VDD on DK ---&gt; VDD (using the DK to power theen-USTelligent Community 13Mon, 20 May 2019 12:33:53 GMThttps://devzone.nordicsemi.com/thread/187914?ContentTypeID=1Mon, 20 May 2019 12:33:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:970daeb3-b2c2-4b4f-b500-a5217b2d728dVidar Berg<p>Hi,</p> <p>Please measure the VDD voltage on the module to confirm that it is indeed 3-3.3 V. VTG must be connected to VDD to enable programming out on the debug out header. Also, if you can try the same with <a href="https://infocenter.nordicsemi.com/topic/ug_nrf5x_cltools/UG/cltools/nrf5x_nrfjprogexe.html?cp=6_1_3">nrfjprog</a> from the command line. E.g., run nrfjprog --recover in case readback protection is enabled.&nbsp;&nbsp;</p><div style="clear:both;"></div>