Issue with NRF52840 DK on NRF Connect for Desktop Bluetooth Low Energy(stand alone version)

[vatronics]

am using the NRF52840 DK to interact with some BLE devices, and I am trying to use NRF Connect for Desktop Bluetooth Low Energy.

While the DK is correctly recognized in the device selection menu (upper left corner), the log terminal shows the following message:

16:45:13.369

Selected device with s/n 001050239546

16:45:15.939

Uploading image through JLink: 0%

16:45:16.182

Device programming completed.

16:45:16.185

Device setup completed

16:45:16.185

Getting information from J-Link debugger...

16:45:16.185

Found device type: unknown. J-Link firmware: J-Link OB-nRF5340-NordicSemi compiled Sep 11 2024 13:35:00.

//--------------------------------------

I have tried reinstalling various versions of J-Link software, but the issue persists. Strangely, this issue did not occur a year ago when I last used the DK.

Could you please assist me in resolving this issue?

[Priyanka]

Hi,

When you connect you nRF52840DK and go to the Programmer app within the nRF Connect for Desktop, and then select you DK from the dropdown menu on the top left corner, do you get any prompts to re-program with new firmware? If so, please do this.

Which version of the DK are you working with?

Also, make sure your nRF Command Line Tools are up-to-date. 

-Priyanka

[vatronics]

- No i get no prompt to re-program with new firmware
- PCA10056 3.0.0  (2022.11)

-nRF Command Line Tools and everything was reinstalled even on new pc with no previous installation

What is worth to be mentioned is that if i use the Programmer and Erase its memory, and then open the Bluetooth Low energy, some times although i get the same message "Found device type: unknown. J-Link firmware: J-Link OB-nRF5340-NordicSemi compiled" , i am able to scan. But on some devices when i try to access a characteristic i get a loading animation with no results

[Priyanka]

Hi,

What is your J-Link verison?

Make sure your nRF Command Line Tools, nRF Connect for Desktop application etc. are up-to-date.

Is your DK being detected by your PC's device manager? What about Programmer? Is you DK being recognized properly there?

-Priyanka

[vatronics]

1) J-Link version: V794e
 2)nRF Command Line Tools, nRF Connect for Desktop application etc. are up-to-date: All now installed

[Priyanka]

Hi,

Could you try nrfjprog --recover -f nrf52 --log

And please attach the .log file generated.

-Priyanka

[stddev]

I observed the same behavior on my DK. Issuing the suggested command, nrfjprog --recover -f nrf52 --log , enables me to re-program DK via nRF Connect Desktop and use it for scanning, etc.