https://devzone.nordicsemi.com/f/nordic-q-a/11994/bootloader-issue-sdk-9Hello, I am trying to understand the basic working principle of the bootloader so i tried the DFU example in the SDK 9 it gets compiled and when i try to flash into the DK it is showing this error so could anyone please tell me what is this error anden-USTelligent Community 13Fri, 19 Feb 2016 10:16:56 GMThttps://devzone.nordicsemi.com/thread/45397?ContentTypeID=1Fri, 19 Feb 2016 10:16:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3c89f741-bcbc-4793-bd4f-afa4d1716bf0Vidar Berg<p>Please try to add the absolute path to the nrfjprog executable in Keil-&gt;options for target -&gt; utilities:</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/5618.Capture2.PNG" alt="image description" /></p> <p>You can download nrfjprog <a href="http://www.nordicsemi.com/eng/nordic/Products/nRF51822/nRF5x-Command-Line-Tools-Win32/33444">here</a> in case you don&#39;t have it installed. The other alternative to using the absolute path is to add the bin directory to your PATH variable.</p><div style="clear:both;"></div>