Programming bootloader on nRF52840

[abe]

Hi, I'm trying to program the nRF52840 bootloader using nRFgo Studio, but I have error as on image here below.
Where I wrong?

[Hung Bui]

Hi Abele, 

The nRF52840 dongle is made to be used as a hardware tool, not a development kit. It's not possible to program it via nRFGo Studio or nrfjprog. There isn't a programmer on it. The easiest way to flash it is via the USB bootloader and nRFConnect. Please follow this instruction. 

It's possible to directly programming the chip via SWD but that requires you have a programmer (can be a nRF52 DK) and connect to P1 port on the dongle. 

[abe]

Hi Hung,

I,m using nRF52840 PDK board, not dongle (see image here below).
I don't know why the nRFGo studio recognize it as dongle.
Have you any other suggest?

Thanks
Abele

[Hung Bui]

I'm sorry I mistaken it as a dongle. The nRFGo studio is obsoleted and doesn't fully support nRF52840. Please try again with nrfjprog.exe or nRFConnect tool. The current version of nrfjprog is 9.8.1

Also please try to flash the default bootloader from our SDK, only flash softdevice  and bootloader. 

[abe]

Ok, thanks.
I will try both tools; nrfjprog has only CLI interface. I think that for customer is best to have a GUI interface (nRFConnect)

Regards
Abele