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Secure DFU over UART issue

Hi,

I have followed sequence in http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.0.0%2Fsdk_app_serial_dfu_bootloader.html&cp=4_0_0_4_3_4 

It says programmed 100% but example not running. Can you specify reason?

Working scenario nrfconnect image when programmed UART bootloader and example image normally

Not working scenario nrfconnect image when programmed UART bootloader and example by giving command nrfutil dfu serial -pkg dfu1.zip -p COM3

Seems softdevice is getting over written

Thanks

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