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how to flash code using dfu service

hi, i have PCA10028 dk board. i want to flash code in this board using dfu. i have generated Zip file(both soft device and application(example ble_app_hrs example)) using nrfjprog.exe.

and flashed dual_bank_bootloader to the pca10028 board using nRFGO studio.

my nRFToolbox app displaying dfuTarget device name in bluetooth scanner. after connecting to the device .

i selected zip file and started uploading. after few sec the device is showing dfu service not added. and process terminating.

so how can i flash code through dfu. thank you..

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