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NRF52 DK Flashing app on external module

I use Adafruit Bluefruit library and developing code to run on Fanstell BT832.

Up to know i have been able to compile several examples and run it on the NRF52 DK board. I have only used their Serial DFU bootloader that work well on DK board.

Now I am trying to Flash a BT832 external module using P20 header and the connection wiring : https://devzone.nordicsemi.com/f/nordic-q-a/20536/programming-external-custom-nrf52832-board-using-nrf52-dk.

I use  nRFgo Studio and apparently successfully flash the code ( it verify successfully). 

But the application do not start on BT832.

What I am doing wrong ?

With nRF go I can only use the direct (Segger menu) method, since the DFU serial dont work it give following message:

- target is not in DFU mode. If using the SDK examples, press Button 4 and RESET and release both to enter DFU mode.

How do I set DFU mode for the external module?

What I am doing wrong?