nrf52840 dongle not detected in nrf connect desktop

[Venkat RAM]

Hi Team,

I am initialized to work on NRF52840 Dongle 

I am trying the flash program in NRF52840 Dongle  via nrf connect for  desktop with the PROGRAMMER app

i am using nrf connect for destop version 12.0  in windows 

But my device does not detect

and also tried on version 3.6,3.11,3.7 but no use

Kindly guide me

Thanks in Advance

Best Regards,

Venkatraaman J S.

[Amanda Hsieh]

Hi, 

It needs to press the reset button to put the Dongle in DFU mode. This is not needed if the currently running application uses the DFU trigger library. Note that the reset button is the sideways button right next to the more obvious SW1 button on the Dongle:

See the  nRF52840 Dongle Programming Tutorial . 

Regards,
Amanda H.

[Venkat RAM]

Hai Amanda ,

I am already tried tapping the sideway reset button, but Still no devices detected in my nrf connect for desktop

kindly support me for further steps

Best Regards,

Venkatraaman J S.

[Amanda Hsieh]

Hi, 

Do you see the Red Led flash on the Dongle after pressing the sideway reset button? If so, you should see the nRF Connect for desktop/Programmer detect the dongle with the name "Open DFU Bootloader". 

If not, did you ever connect the Dongle with external debugger to flash other image?

Regards,
Amanda H.

[Venkat RAM]

Hai Amanda ,

I  do see a Green color led glowing while plugged to the USB port in my laptop

While tapping the Side way led button, the Green LED toggle off and again flash

I can't find the red LED flash, where is the problem?

Best Regards,

Venkatraaman J S.

[Amanda Hsieh]

Hi,

It might be that the reset button lost the function or the Open DFU Bootloader is erased. Then, you would need an external debugger such J-Link or DK to program the code or the production bootloader (see the instruction in that tutorial). 

-Amanda H.