nRF52840 DK not showing up in nRF Connect for VS Code ("No devices found")

[seongmincho]

Hi all,

In Device Manager, my nRF52840 DK is recognized as follows:

JLink CDC UART Port (COM32)
JLink CDC UART Port (COM33)
USB Serial Device (COM22) — running a Zephyr CDC ACM sample

However, in nRF Connect for VS Code > CONNECTED DEVICES, it says "No devices found."
Strangely, after rebooting the PC, the board appears temporarily, but then disappears again after a short while.

Things I've tried:
Reinstalling nRF Connect SDK and VS Code (Link)
Rebooting the computer

Could anyone help me troubleshoot this issue?

Generated support information, nrf-connect-support-20250804001607

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// If you do not want others to see this information, make sure to remove it before sharing the data.

// For help and support, visit Nordic Semiconductor's DevZone at https://devzone.nordicsemi.com/.

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[Susheel Nuguru]

This seems to be very similar to the issue reported by one of the customers three months ago here. Do you have the latest plugin for nrf connect in the VSC? if not please update it and try again. If you have the latest already, then try to revert it to the version mentioned in that link I attached here. It would also help if you can have late latest Jlink drivers from Segger website.

[seongmincho]

Thank you for your advice!

My desired environment:
Toolchain: v2.6.0
SDK: v2.6.0

So what you're saying is that, with the following setup, the nRF52840DK will be detected correctly, right?

• Latest version of J-Link (V8.56a)
• Latest version of nrfutil
• Older version of the nRF Connect extension pack

[Susheel Nuguru]

Can you do "nrfjprog -i" on the command prompt to see if that is working?

I am not sure why this is not working for you.

I am also using Windows 11 and now have vscode 1.102.3 with the nRF52840 DK. 

Can you try to change the Device provider from nrfUtil to nrfjprog as shown below?

[seongmincho]

HI!

Thank you very much for your response. Your advice is extremely valuable to me.

I am currently facing the following two issues that need to be resolved:

1. nrfjprog issue
This issue occurs only when the SDK and Toolchain are set to version v2.6.0.
(When using v3.0.2, the warning message does not appear.)

2. Device not detected ("No device found")
With v3.0.2, nrfjprog works without issues, but the device is not detected.

Additionally, in the NRF Connect for VS Code settings, the "Nrf-connect: Device Provider" option is not visible, which may be related.

[seongmincho]

seongmincho said:

JLink_V8.56a
nrfutil 2.12.6 → nrfutil-device(2.8.8), nrfutil-sdk-manager(1.3.0)

VSCODE extension
nordic-semiconductor.nrf-connect "version": "2025.5.152"
nordic-semiconductor.nrf-terminal "version": "2024.9.14"
nordic-semiconductor.nrf-devicetree "version": "2025.4.22"
nordic-semiconductor.nrf-kconfig "version": "2025.4.26"

Toolchains: v3.0.2
nRF Connect SDK: v3.0.2

Even with the above setup, the DK is not detected in VSCode.

Regardless of everything else, shouldn't it at least be working at this point???

I uninstalled everything and reinstalled it.

(I followed step from this
link: academy.nordicsemi.com/.../)

[seongmincho]

I followed the exact same steps and setup on another PC, and the device(nRF52840 DK) was detected.

I have no idea why it doesn't work on my office PC. It's frustrating. :(

[Susheel Nuguru]

I feel bad for your experience, but until we can reproduce it at our end consistently, it is hard to give a solution or any workaround.