No Cortex-M SW Device Found?

Question

I have the eval board pca 10001. After compiling the demo app for nrf51822_xxaa (256k), keil displays "no cortex-m sw device found" when I trying to flash or debug from their ide. 
 However, I'm able to use the Nordic Semi master control panel to flash the board using the compiled hex file. After doing that, the 2 leds alternately blink. 
 I ran the recover option using the nrfgostudio successfully, but keil still displays the same message. 
 I tried reinstalling keil, segger, nordic sdk, but no luck. Any idea what could I could be doing wrong? Thanks.

Ole Morten · Accepted Answer

Have you seen this question ? 
 If neither of the problems shown there helps, I'd recommend you to open the target options in Keil, go to the debug settings, and make sure that the J-Link selected there is the correct one (as identified by the serial number). Also make sure that the interface is set to SW, not JTAG, and that you can see a chip in the upper right corner. 
 Finally, you should make sure that you don't use version 4.76 of the Segger tools, as this apparently had a bug causing issues with our devices. Both older and newer versions (4.76a and above) should work fine. 
 BTW, Master Control Panel isn't meant to flash regular applications, the feature is there just to be able to program the Master Emulator firmware. For normal applications, you should rather use nRFgo Studio.