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nRF52840, buttonless dfu error

Dear All.

I'm using nRF52840 DK, 15.3.0 SoftDevice, Segger.

I'm testing DFU and have some question. and i'm begginer with all

I'm so sorry in advance.

First. 

I flashed example "ble_app_buttonless_dfu"  but it crashed with "no bootloader found" and it's not advertising.

I noticed that the problem is literally the boot loader doesn't exist. am i right?

Am I doing wrong with this ble_app_buttonless_dfu?

Second.  

So I tried another method to use DFU.

I flashed "sd_s140_bootloader_buttonless_with_setting_page_dfu_secure_ble_debug_with_bonds.hex" with nRFgo

but It said "programming failed : Verification failed". like below

 

So I tried to flash it with nRF Connect.

then it said to me a lot of things are going to wrong like below 

how do I flash it and watch its advertising?

Third.

I have also nRF52832 which is custom board that I didn't design

In this board, the "sd_s132_bootloader_buttonless_with_setting_page_dfu_secure_ble_debug_with_bonds.hex" with nRFgo is flashed well

but not advertising, I thinks it didn't work  becase the some clock config things

I usually use this board with this code(some clock config)

so, the question is can i make some change with the "sd_s132_bootloader_buttonless_with_setting_page_dfu_secure_ble_debug_with_bonds.hex"

to config the clock things to see its advertising.

if I am doing wrong, please let me know how i use this buttonless dfu example.

thanks.

best regard.

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