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nrf52840 bootloader test

Hi,

I am trying to use bootloader and following  https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader

In Step D1, For bootloader binary, I built examples\dfu\secure_bootloader\pca10056_ble\armgcc. But, I can't see DfuTarg in the nrfConnect app after flashing softdevice and bootloader. 

[ command for flash softdevice and bootloader ]

1. flash softdevice

  nrfjprog -f nrf52 --program $(SDK_ROOT)/components/softdevice/s140/hex/s140_nrf52_6.1.1_softdevice.hex --sectorerase
  nrfjprog -f nrf52 --reset
2. flash bootloader
  nrfjprog -f nrf52 --program nrf52840_xxaa_s140.hex --sectorerase
  nrfjprog -f nrf52 --reset
What can I do for debugging this? And Can I see debug logs of boot loader through uart?
Thank you.