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.

[helsing]

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

Nordic has a lately launched DevCademy that is aimed towards getting started as well as learning new skills. Check out nRF Connect SDK Fundamentals. The nRF52840 DK is covered by this guide.

Programming the nRF52840 Dongle:

the Dongle seem not able to work.

This is could be due to the UCIR being deleted.

Does the Dongle need a special boot image?

The J-link Lite supports only a target voltage of 3.3 V while the GPIO voltage (REG0) is by default 1.8 V on the nRF52840. A solution is to use a debugger that is able to program down to 1.8 V volt. Other solutions are suggested in our dongle programming tutorial. See the section Recover after an accidental UICR erase.

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.

This section from the nRF Connect Programmer documentation covers custom boards(even though the section headline only mentions DKs and the nRF51 Dongle.

[binhla]

Thank you for your promp response. 

I will check it.

If i already had erased the Dongle, will it work if I only flash the Blink example?

Will the COM driver be available again?

Can you provide an image that can be programed into the Dongle so it will return to the original state?