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Cannot debug ble_app_buttonless_dfu SDK 15

I've used the 'secure_bootloader' project, updated with the public key, to flash on the DK. The project 'ble_app_buttonless_dfu' built and packaged as zip can be DFU'd with nRF51 dongle and with iOS nRF Toolkit app, so in this perspective it works just fine. The issue is when I try to debug the 'ble_app_buttonless_dfu' project from SES, it would flash but would not start in main() or hit any breakpoint set, nor show any debug RTT logs. A non-dfu application, like 'ble_app_beacon' can be debugged without any issues. What am I missing?

Setup:

Hardware: nRF52 DK PCA10040

SDK: nRF5_SDK_15.0.0_a53641a

SD: s132_nrf52_6.0.0_softdevice.hex

SEGGER Embedded Studio 3.30

Thanks!

EDIT: I can 'Attach Debugger' to already DFU'd  application 'ble_app_buttonless_dfu' and it works properly, breakpoints hit and logs available.

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