https://devzone.nordicsemi.com/f/nordic-q-a/9145/nrf51822aa-keil-setingHi, I found several posts on this forum closely related to my problem, but non of this answer my needs. I try to program nRF51822AA with blinky example via Keil uVision. I define my custom board for this purpose. What trouble me: I can not upload programen-USTelligent Community 13Thu, 10 Sep 2015 16:57:40 GMThttps://devzone.nordicsemi.com/thread/33698?ContentTypeID=1Thu, 10 Sep 2015 16:57:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c80dfb7d-a730-4bd5-85da-288f0ae18907Vrabec<p>I found solution: Change programming algorithm to nRF51 External Connectivity Board do the trick. <img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/uvision4.png" alt="Solution" /></p><div style="clear:both;"></div>