Cannot upload user application code if Bootloader programmedhttps://devzone.nordicsemi.com/f/nordic-q-a/25589/cannot-upload-user-application-code-if-bootloader-programmedHI, I am using nRF51822 by Keil compiler. I found if it was programmed with boot loader nrf51422_xxac_s130.hex by nRFGo Studio. Then if download user code by Keil, it cannot run anymore. But if upload a zipped user code through DFU with priven-USTelligent Community 13Mon, 02 Oct 2017 09:39:31 GMTRE: Cannot upload user application code if Bootloader programmedhttps://devzone.nordicsemi.com/thread/100870?ContentTypeID=1Mon, 02 Oct 2017 09:39:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5fe0cf39-d29e-41bc-af34-2842e48d5675Stian R&#248;ed Hafskjold<p>The bootloader is looking for a settings page at the end of flash to see if the application is valid. This settings page is created automatically when you upload your application code through the DFU. If you flash your app code manually through Keil or similar you need to generate and flash the settings page manually. Please have a look at this guide: <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.tools/dita/tools/nrfutil/nrfutil_settings_generate_display.html">infocenter.nordicsemi.com/.../nrfutil_settings_generate_display.html</a></p><div style="clear:both;"></div>