https://devzone.nordicsemi.com/f/nordic-q-a/17958/no-jlink-device-found-flash-download-failed---target-dll-has-been-cancelledI just setup Keill uVision V5.21 with nRF52 DK. I was able to flash the ble_app_uart example onto the board. When I realized that I missed out the softdevice, I just drag and drop the s132_nrf52_3.0.0_softdevice.hex into the DK USB drive. The board runsen-USTelligent Community 13Fri, 25 Nov 2016 12:39:24 GMThttps://devzone.nordicsemi.com/thread/69254?ContentTypeID=1Fri, 25 Nov 2016 12:39:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fdf8cb66-fbdb-4820-8b51-107a494700f3Petter Myhre<p>Thanks for adding an answer, and for the feedback.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/69253?ContentTypeID=1Fri, 25 Nov 2016 08:57:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9f086de6-5307-4a64-a749-f4601413d968daniel77<p>Alright, I found the answer from another post. There were many posts and many answers related to this that were confusing. Just reinstall the nRF5x-Command-Line-Tools and then check the box to replace the JLinkARM.dll in C:\Keil_v5\ARM\Segger. My advice is for Nordic to put this onto the Keil installation tutorial than letting user search through the answers one by one.</p><div style="clear:both;"></div>