https://devzone.nordicsemi.com/f/nordic-q-a/4096/could-not-connect-to-target1,I use nrfgo studio and can download softdevice ,it is OK. 2,I use the s110 example,it runs ok too. 3,I modify something from the example ,and click debug(keil),but it just earse the chip,and download the xxx.hex file,and it stop debug automaticlyen-USTelligent Community 13Wed, 15 Oct 2014 08:16:32 GMThttps://devzone.nordicsemi.com/thread/14674?ContentTypeID=1Wed, 15 Oct 2014 08:16:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2253a68d-f4bf-4c97-96c2-affeeeb6ca3eAsbj&#248;rn<p><a href="https://devzone.nordicsemi.com/question/18015/could-not-connect-to-the-target-chip/">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>