program the default DFU boot loader as per factory outlet.

[melt]

Goodday all,

I have a few nrf52840 dongles that is not being picked up by the usb anymore. I have been looking for ways to reload them back to "factory defaults" but cant find an exact procedure. 

just to mention the small reset button does not do anything at this stage. I do have a DK board and cable. 

I presume I need to do it through the DK but im worried  doing it incorrectly will also render my DK non operation-able

This is how I see it : 

1. connect dongle to DK kit via 10 pin cable

2. open nRF52go studio and select "program bootloader" tab

3. Which hex file should I choose? there is a few

4.  I  to bridged pin 1.10 with ground and keep the reset button pushed.

Will this work?

If not please direct me to a link with the procedure

thanks in advance

[Marjeris Romero]

Hi,

nRF52go studio is deprecated, you should use the Programmer app in nRF Connect for Desktop to program the dongle.

Download the latest version, and inside the app choose "Add/remove apps".

Download the "Programmer" app. More documentation for the app can be found in this GitHub repository.

Are you able to see the dongle bootloader in the red area? If not you need to program a new bootloader, see this case here for more help.

Best Regards,

Marjeris

[melt]

Thank you Romero I managed to come right

for completeness and my future reference.

I downloaded the bootloader hex file for the dongle https://devzone.nordicsemi.com/f/nordic-q-a/40924/how-can-i-restore-the-original-bootloader-of-a-pca10059/159115#159115

Renamed it to pca10059.hex  (to shorten)  and  copied to the nfjprog.exe directory. Connect Jlink cable from dk to dongle 

 nrfjprog -e -f nrf52
 nrfjprog --program pca10059.hex -f nrf52
 nrfjprog --reset -f nrf52