https://devzone.nordicsemi.com/f/nordic-q-a/64065/a-problem-from-experimental----flashing-dfu-will-stop-flashing-dongle-by-dk-sesHi There More recently, I have implemented the experimental of nrf52840 Dongle ,which is about Er asing it with nrfjprog or programming it with SES by DK. The dongle will lose its Boot-loader and its ability to be programmed through the USB interfaceen-USTelligent Community 13Fri, 24 Jul 2020 00:37:47 GMThttps://devzone.nordicsemi.com/thread/261479?ContentTypeID=1Fri, 24 Jul 2020 00:37:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c636a836-4d21-48c8-a7a9-228ae0b4533dDi-sheng<p>Hi Hung Bui</p> <p>I&nbsp;need some time to study that.</p> <p>Thanks,</p> <p>Di-Sheng</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/261383?ContentTypeID=1Thu, 23 Jul 2020 13:42:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1c8cbecd-c145-45d6-babc-82e0deb172f1Hung Bui<p>Hi Di-sheng,&nbsp;</p> <p>Please verify, do you have the bootloader on the dongle ?&nbsp;<br />If you have the bootloader on the dongle , you should update application via the DFU interface which is nRF Connect programmer or nrfutil.&nbsp;</p> <p>The bootloader when booting will do CRC check of the application image and if the CRC check won&#39;t match it won&#39;t start the application.&nbsp;</p> <p>This is the case when you flash your application using SES.&nbsp;<br />So there are 2 option, one is to modify the bootloader not to check for CRC. Second option is to generate bootloader setting which contain the CRC that match with your new application.&nbsp;<br />Option 2 is discussed here:&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/34212/howto-flash-bootloader-settings-for-dfu-using-ses-at-debug-time">https://devzone.nordicsemi.com/f/nordic-q-a/34212/howto-flash-bootloader-settings-for-dfu-using-ses-at-debug-time</a></p><div style="clear:both;"></div>