DFUTarg unable to boot nRF52840 DK into DFUTarg DFU mode

[JAC]

I'm trying every permutation.

Pressing IF BOOT/RESET button along with BUTTON 4 and powering off and on the board ... then letting the buttons go

There is a reset pin ... but how do you use this?

I can successful upload all Nordic SDK perpherial examples to the board...

I'm trying to setup OTA and using nRF connect.

Any ideas what to try next

[tesc]

Hi,

Actually there are two microcontrollers on the DK. There is the nRF52840, of course, which the DK is for. Then there is a programmer MCU that provides the SEGGER J-Link interface for programming the nRF52840. Holding IF BOOT/RESET pressed while powering the board is for setting that programmer MCU into its firmware upgrade state. It has nothing to do with DFU solutions on the nRF52840.

For a complete guide on how to set up and use our DFU bootloader, please have a look at Getting started with Nordic's Secure DFU bootloader, a step by step guide.

Regards,
Terje