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

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

// IMPORTANT: The following data can contain sensitive or confidential information about your environment.
// 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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Parents
  • 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.

  • 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
  • Following your advice, I tried troubleshooting as below.

    Here is a summary:

    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": "2024.12.55"
    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: v2.6.0
    nRF Connect SDK: v2.6.0

    Issue Description
        - After rebooting the computer, the device is initially detected under "CONNECTED DEVICES" in VS Code.
        - At some point, it changes to "No devices found." and the device is no longer detected.
        - However, the device still appears correctly in Device Manager.
        - Moreover, UART communication with the device works via its COM port in MATLAB.
        - There's also the following issue:

    Q. What can be done to resolve this?

    +Generate Support information

    // IMPORTANT: The following data can contain sensitive or confidential information about your environment.
    // 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/.
    
    {
      "platform": {
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        "osVersion": "Windows 11 Pro",
        "osKernel": "10.0.22631",
        "vscode": "1.102.3",
        "electron": "35.6.0",
        "node": "v22.15.1"
      },
      "system": {
        "date": "2025-08-05T07:24:10.053Z",
        "vscodeRoot": "c:\\Users\\rsef4\\AppData\\Local\\Programs\\Microsoft VS Code\\resources\\app",
        "nrfConnectForDesktopInstalled": false,
        "vscodeUptime": "00:00:29",
        "osUptime": "06:15:53",
        "cpu": "11th Gen Intel(R) Core(TM) i5-11500 @ 2.70GHz"
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        ]
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              "id": "c:\\ncs\\Myproject\\241223_test_ONOFF_mini\\build",
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              "type": "Zephyr",
              "isChild": false,
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        {
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          "uri": "c:\\ncs\\Myproject\\DK_uart_GPIO_TIMER_250803",
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              "boardId": "nrf52840dk_nrf52840",
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              "toolchain": "nRF Connect SDK Toolchain v2.6.0"
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  • 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.

    +Generate Support information

    // IMPORTANT: The following data can contain sensitive or confidential information about your environment.
    // 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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              "sdk": "c:\\ncs\\v2.6.0",
              "toolchain": "nRF Connect SDK Toolchain v2.6.0"
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              "type": "Sysbuild",
              "isChild": false,
              "isStale": false,
              "taskBindings": {
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                "pristineBuild": [],
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              },
              "sdk": "c:\\ncs\\v3.0.2",
              "toolchain": "nRF Connect SDK Toolchain v3.0.2"
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          ]
        },
        {
          "workspace": "c:\\ncs\\Myproject\\DK_uart_GPIO_TIMER_250803",
          "uri": "c:\\ncs\\Myproject\\DK_uart_GPIO_TIMER_250803",
          "buildConfigurations": [
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              "isChild": false,
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  • 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?

  • 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.

  • 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/.../)

Reply
  • 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/.../)

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