How to re program my nRF52840 dongle with NRF Connect SDK?

[binhla]

Hi, I'm new to the NRF Connect SDK, as well as nRF Connect for Desktop.

I have a nRF52840 Dongle and a nRF52840DK. 

The nRF52840DK worked well. But I could not program the nRF52840 Dongle.

I tried to connect it with the J-Link USB. But after I successful programed the device using J-Flash Lite, the Dongle seem not able to work.

Can you help me? I do not know what I missed? 

Does the Dongle need a special boot image?

And It should be kind if there is a Guide for programming the NRF Connect SDK output .hex file into direct SOCs, not to the DK or Dongle boards.

[binhla]

Dears, I had done bring back the Dongle with "Revert to production bootloader".

Many thanks. 

I was not able to use the DK, but a Jlink could make it. 

First, cut the SB2, soldered the SB1

Second, connected the Dongle with the Jlink as the photo.

Dongle ============ Jlink

VDD OUT ---------------> 3.3V

GND ----------------------> 3.3V

SWDCLK ----------------> TCK

SWDIO--------------------> TMS

Third, connect the Jlink to the computer. Using the nRF Connect Programmer, flash the graviton_bootloader in pca10059_bootloader.zip, 

Four, cut the SB1, soldered the SB2