VS Code: SeggerBackend jlinkarm.dll reported error at line ...

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

Elfving — Tue, 24 Mar 2026 08:59:46 GMT

Glad to hear it! Let us know if there is anything else!

Regards,

Elfving

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

albert_1977 — Tue, 24 Mar 2026 00:56:05 GMT

Hi Elfving,

Thanks for your answer. That was the solution I was looking for. I just tried it and it works.

Cheers,

Alberto

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

Elfving — Mon, 23 Mar 2026 12:11:24 GMT

Hi Alberto,

Sorry about the confusion here, but Benjamin is currently OOO, so I'll take over this case for a bit.

It seems to me that the issue in the original post was taken care of, and solved by using the recommended JLink version. Though a new issue, that you are currently discussing, is how to connect an app to a specifc device in VSC? If so, have you seen this?

Regards,

Elfving

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

albert_1977 — Tue, 17 Mar 2026 01:16:39 GMT

The attached file is the output of the 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": {
    "os": "win32",
    "osVersion": "Windows 11 Pro",
    "osKernel": "10.0.26200",
    "vscode": "1.111.0",
    "electron": "39.6.0",
    "node": "v22.22.0",
    "appName": "Visual Studio Code",
    "appHost": "desktop"
  },
  "system": {
    "date": "2026-03-17T01:09:00.395Z",
    "vscodeRoot": "c:\\Local\\Programs\\Microsoft VS Code\\ce099c1ed2\\resources\\app",
    "nrfConnectForDesktopInstalled": true,
    "vscodeUptime": "16:27:19",
    "osUptime": "118:34:21",
    "cpu": "13th Gen Intel(R) Core(TM) i7-13700H"
  },
  "workspace": {
    "name": "ble_xxx",
    "workspaceFile": null,
    "folders": [
      "c:\\Projects\\_\\Firmware\\ble_xxx"
    ]
  },
  "sdks": [
    {
      "version": "v3.1.1",
      "path": "c:\\ncs\\v3.1.1"
    }
  ],
  "activeBuild": "/Users/Firmware/ble_xxx/build/ble_xxx",
  "apps": [
    {
      "workspace": "c:\\Projects\\_\\Firmware\\ble_xxx",
      "uri": "c:\\Projects\\_\\Firmware\\ble_xxx",
      "buildConfigurations": [
        {
          "id": "/Users/Firmware/ble_xxx/build",
          "name": "build",
          "boardId": "ble_xxx/nrf52840",
          "type": "Sysbuild",
          "isChild": false,
          "isStale": false,
          "taskBindings": {
            "build": [],
            "pristineBuild": [],
            "flash": [],
            "eraseAndFlash": []
          },
          "sdk": "c:\\ncs\\v3.1.1",
          "toolchain": "nRF Connect SDK Toolchain v3.1.1"
        },
        {
          "id": "/Users/Firmware/ble_xxx/build/ble_xxx",
          "name": "build/ble_xxx",
          "boardId": "ble_xxx/nrf52840",
          "type": "Zephyr",
          "isChild": true,
          "isStale": false,
          "taskBindings": {
            "build": [],
            "pristineBuild": [],
            "flash": [],
            "eraseAndFlash": []
          },
          "sdk": "c:\\ncs\\v3.1.1",
          "toolchain": "nRF Connect SDK Toolchain v3.1.1"
        }
      ]
    }
  ],
  "toolchains": [
    {
      "version": "3.1.1",
      "path": "c:\\ncs\\toolchains\\c1a76fddb2",
      "displayName": "nRF Connect SDK Toolchain v3.1.1",
      "compilerTools": [
        "Zephyr SDK (arm) 0.17.0",
        "Zephyr SDK (riscv) 0.17.0"
      ]
    }
  ],
  "connectedDevices": [
    {
      "serialNumber": "000603005698",
      "deviceFamily": "NRF52_FAMILY",
      "deviceName": "nRF52840",
      "deviceVersion": "NRF52840_xxAA_REV2",
      "jlinkObFirmwareVersion": "J-Link V13 compiled Feb 26 2026 08:54:38",
      "protectionStatus": "NRFDL_PROTECTION_STATUS_NONE",
      "protectionStatusCore": "NRFDL_DEVICE_CORE_APPLICATION"
    },
    {
      "serialNumber": "001E000C5553500C20393256"
    }
  ],
  "tools": {
    "C:\\ncs\\toolchains\\c1a76fddb2\\opt\\zephyr-sdk\\arm-zephyr-eabi\\bin\\arm-zephyr-eabi-gcc.exe": "0.17.0",
    "C:\\Program Files\\SEGGER\\JLink\\JLink.exe": "8.20",
    "C:\\Program Files\\Nordic Semiconductor\\nrf-command-line-tools\\bin\\nrfjprog.exe": "10.23.2",
    "C:\\ncs\\toolchains\\c1a76fddb2\\nrfutil": "8.1.1",
    "C:\\ncs\\toolchains\\c1a76fddb2\\nrfutil\\home\\bin\\nrfutil-device.exe": "2.13.2",
    "C:\\ncs\\toolchains\\c1a76fddb2\\cmake": "3.21.0",
    "C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\Scripts\\west.exe": "1.4.0",
    "C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\python.exe": "3.12.4",
    "C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\ninja.exe": "1.10.2",
    "C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\gperf.exe": "3.1",
    "C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\dtc.exe": "1.4.7",
    "C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\gn.exe": "2223",
    "C:\\ncs\\toolchains\\c1a76fddb2\\mingw64\\bin\\git.exe": "git version 2.37.3.",
    "debugger (arm)": "c:\\ncs\\toolchains\\c1a76fddb2\\opt\\zephyr-sdk\\arm-zephyr-eabi\\bin\\arm-zephyr-eabi-gdb.exe",
    "debugger (riscv)": "c:\\ncs\\toolchains\\c1a76fddb2\\opt\\zephyr-sdk\\riscv64-zephyr-elf\\bin\\riscv64-zephyr-elf-gdb.exe"
  },
  "nrfutil": {
    "nrfutil-device": {
      "version": "2.17.1",
      "binPath": "c:\\.vscode\\extensions\\nordic-semiconductor.nrf-connect-2026.3.1484-win32-x64\\platform\\nrfutil\\bin\\nrfutil-device",
      "jlinkInfo": {
        "description": "This version of SEGGER J-Link is different from the J-Link version that was used to test nrfutil device commands",
        "expectedVersion": {
          "version": "JLink_V8.76",
          "versionFormat": "string"
        },
        "name": "JlinkARM",
        "version": "JLink_V8.20",
        "versionFormat": "string"
      }
    },
    "nrfutil-sdk-manager": {
      "version": "1.11.0",
      "binPath": "c:\\.vscode\\extensions\\nordic-semiconductor.nrf-connect-2026.3.1484-win32-x64\\platform\\nrfutil\\bin\\nrfutil-sdk-manager"
    }
  },
  "environment": {
    "westEnv": {
      "HOME": "C:",
      "HOMEDRIVE": "C:",
      "HOMEPATH": "",
      "PATH": "C:\\ncs\\toolchains\\c1a76fddb2;C:\\ncs\\toolchains\\c1a76fddb2\\mingw64\\bin;C:\\ncs\\toolchains\\c1a76fddb2\\bin;C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin;C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\Scripts;c:/ncs/toolchains/c1a76fddb2\\opt/nanopb/generator-bin;C:\\ncs\\toolchains\\c1a76fddb2\\nrfutil\\bin;C:\\ncs\\toolchains\\c1a76fddb2\\opt\\zephyr-sdk\\arm-zephyr-eabi\\bin;C:\\ncs\\toolchains\\c1a76fddb2\\opt\\zephyr-sdk\\riscv64-zephyr-elf\\bin;c:\\.vscode\\extensions\\nordic-semiconductor.nrf-connect-2026.3.1484-win32-x64\\platform\\nrfutil\\lib\\nrfutil-sdk-manager;C:\\Local\\Programs\\Microsoft VS Code;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Windows\\System32\\OpenSSH\\;C:\\Program Files\\dotnet\\;C:\\Program Files\\NVIDIA Corporation\\NVIDIA NvDLISR;C:\\Program Files\\Git\\cmd;C:\\Program Files\\Nordic Semiconductor\\nrf-command-line-tools\\bin\\;C:\\Program Files\\MATLAB\\R2023b\\runtime\\win64;C:\\Program Files\\MATLAB\\R2023b\\bin;C:\\Program Files (x86)\\Pololu\\Tic\\bin;C:\\Program Files (x86)\\NVIDIA Corporation\\PhysX\\Common;C:\\WINDOWS\\system32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem;C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\;C:\\WINDOWS\\System32\\OpenSSH\\;C:\\Program Files\\Docker\\Docker\\resources\\bin;C:\\Local\\Microsoft\\WindowsApps;C:\\Local\\Programs\\Microsoft VS Code\\bin;C:\\protoc-24.4-win64\\bin;C:\\nanopb-0.4.7-windows-x86\\generator-bin;C:\\Qt\\Tools\\CMake_64\\bin;C:\\ninja;C:\\Qt\\6.6.2\\mingw_64\\bin;C:\\ST\\STM32CubeIDE_1.14.0\\STM32CubeIDE\\plugins\\com.st.stm32cube.ide.mcu.externaltools.make.win32_2.1.101.202401061624\\tools\\bin;C:\\ST\\STM32CubeIDE_1.14.0\\STM32CubeIDE\\plugins\\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235\\tools\\bin;C:\\Program Files\\STMicroelectronics\\STM32Cube\\STM32CubeProgrammer\\bin;C:\\Xilinx\\Vivado\\2024.1\\bin;C:\\Xilinx\\Vivado\\2024.1\\lib\\win64.o;C:\\GHDL\\bin;C:\\GHDL\\lib\\ghdl\\vendors;",
      "ZEPHYR_BASE": "c:\\ncs\\v3.1.1\\zephyr",
      "ZEPHYR_TOOLCHAIN_VARIANT": "zephyr",
      "ZEPHYR_SDK_INSTALL_DIR": "c:\\ncs\\toolchains\\c1a76fddb2\\opt\\zephyr-sdk",
      "PYTHONPATH": "C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin;C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\Lib;C:\\ncs\\toolchains\\c1a76fddb2\\opt\\bin\\Lib\\site-packages"
    },
    "inherited": {
      "HOME": "C:",
      "HOMEDRIVE": "C:",
      "HOMEPATH": "",
      "Path": "C:\\Local\\Programs\\Microsoft VS Code;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Windows\\System32\\OpenSSH\\;C:\\Program Files\\dotnet\\;C:\\Program Files\\NVIDIA Corporation\\NVIDIA NvDLISR;C:\\Program Files\\Git\\cmd;C:\\Program Files\\Nordic Semiconductor\\nrf-command-line-tools\\bin\\;C:\\Program Files\\MATLAB\\R2023b\\runtime\\win64;C:\\Program Files\\MATLAB\\R2023b\\bin;C:\\Program Files (x86)\\Pololu\\Tic\\bin;C:\\Program Files (x86)\\NVIDIA Corporation\\PhysX\\Common;C:\\WINDOWS\\system32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem;C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\;C:\\WINDOWS\\System32\\OpenSSH\\;C:\\Program Files\\Docker\\Docker\\resources\\bin;C:\\Local\\Microsoft\\WindowsApps;C:\\Local\\Programs\\Microsoft VS Code\\bin;C:\\protoc-24.4-win64\\bin;C:\\nanopb-0.4.7-windows-x86\\generator-bin;C:\\Qt\\Tools\\CMake_64\\bin;C:\\ninja;C:\\Qt\\6.6.2\\mingw_64\\bin;C:\\ST\\STM32CubeIDE_1.14.0\\STM32CubeIDE\\plugins\\com.st.stm32cube.ide.mcu.externaltools.make.win32_2.1.101.202401061624\\tools\\bin;C:\\ST\\STM32CubeIDE_1.14.0\\STM32CubeIDE\\plugins\\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235\\tools\\bin;C:\\Program Files\\STMicroelectronics\\STM32Cube\\STM32CubeProgrammer\\bin;C:\\Xilinx\\Vivado\\2024.1\\bin;C:\\Xilinx\\Vivado\\2024.1\\lib\\win64.o;C:\\GHDL\\bin;C:\\GHDL\\lib\\ghdl\\vendors;",
      "PATH": "C:\\Local\\Programs\\Microsoft VS Code;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\;C:\\Windows\\System32\\OpenSSH\\;C:\\Program Files\\dotnet\\;C:\\Program Files\\NVIDIA Corporation\\NVIDIA NvDLISR;C:\\Program Files\\Git\\cmd;C:\\Program Files\\Nordic Semiconductor\\nrf-command-line-tools\\bin\\;C:\\Program Files\\MATLAB\\R2023b\\runtime\\win64;C:\\Program Files\\MATLAB\\R2023b\\bin;C:\\Program Files (x86)\\Pololu\\Tic\\bin;C:\\Program Files (x86)\\NVIDIA Corporation\\PhysX\\Common;C:\\WINDOWS\\system32;C:\\WINDOWS;C:\\WINDOWS\\System32\\Wbem;C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\;C:\\WINDOWS\\System32\\OpenSSH\\;C:\\Program Files\\Docker\\Docker\\resources\\bin;C:\\Local\\Microsoft\\WindowsApps;C:\\Local\\Programs\\Microsoft VS Code\\bin;C:\\protoc-24.4-win64\\bin;C:\\nanopb-0.4.7-windows-x86\\generator-bin;C:\\Qt\\Tools\\CMake_64\\bin;C:\\ninja;C:\\Qt\\6.6.2\\mingw_64\\bin;C:\\ST\\STM32CubeIDE_1.14.0\\STM32CubeIDE\\plugins\\com.st.stm32cube.ide.mcu.externaltools.make.win32_2.1.101.202401061624\\tools\\bin;C:\\ST\\STM32CubeIDE_1.14.0\\STM32CubeIDE\\plugins\\com.st.stm32cube.ide.mcu.externaltools.gnu-tools-for-stm32.11.3.rel1.win32_1.1.100.202309141235\\tools\\bin;C:\\Program Files\\STMicroelectronics\\STM32Cube\\STM32CubeProgrammer\\bin;C:\\Xilinx\\Vivado\\2024.1\\bin;C:\\Xilinx\\Vivado\\2024.1\\lib\\win64.o;C:\\GHDL\\bin;C:\\GHDL\\lib\\ghdl\\vendors;"
    }
  },
  "terminal": {
    "defaultProfile": "Anaconda"
  },
  "config": {
    "nordic-semiconductor.nrf-connect": {
      "ozonePath": "",
      "applications": [
        "${workspaceFolder}"
      ],
      "applicationOptions": {},
      "west": {
        "env": {
          "$base": "terminal"
        },
        "verbose": ""
      },
      "boardRoots": [
        "C:\\Projects\\nrf_boards"
      ],
      "taskBindings": {},
      "buildTerminal": {
        "condensedProgress": true
      },
      "debugging": {
        "flash": true,
        "bindings": {
          "${workspaceFolder}/build/ble_xxx": "Launch ble_xxx/build/ble_xxx"
        },
        "justMyCode": false,
        "focusOnNrfDebug": true
      },
      "activeAppFollowActiveEditor": true,
      "flash": {
        "softreset": false,
        "erase": false,
        "recover": false
      },
      "enableTelemetry": true,
      "thirdpartyIntegration": {},
      "toolchainManager": {
        "indexURL": null,
        "installDirectory": null
      },
      "sdkManager": {
        "region": "default"
      },
      "defaultOpenAction": "ask",
      "terminalProfile": {
        "shell": {}
      },
      "remoteDevices": [],
      "toolchain": {
        "path": "${nrf-connect.toolchain:2.5.0}"
      },
      "deviceProvider": "nrfjprog"
    },
    "nordic-semiconductor.nrf-terminal": {
      "terminalMode": "character",
      "localEcho": false
    }
  },
  "extensions": {
    "internal": {
      "nordic-semiconductor.nrf-connect": {
        "version": "2026.3.1484",
        "path": "c:\\.vscode\\extensions\\nordic-semiconductor.nrf-connect-2026.3.1484-win32-x64",
        "isActive": true
      },
      "nordic-semiconductor.nrf-terminal": {
        "version": "2026.3.273",
        "path": "c:\\.vscode\\extensions\\nordic-semiconductor.nrf-terminal-2026.3.273",
        "isActive": true
      },
      "nordic-semiconductor.nrf-devicetree": {
        "version": "2026.3.617",
        "path": "c:\\.vscode\\extensions\\nordic-semiconductor.nrf-devicetree-2026.3.617",
        "isActive": true
      },
      "nordic-semiconductor.nrf-kconfig": {
        "version": "2026.1.230",
        "path": "c:\\.vscode\\extensions\\nordic-semiconductor.nrf-kconfig-2026.1.230",
        "isActive": true
      }
    },
    "external": {
      "marus25.cortex-debug": null,
      "ms-vscode.cpptools": "1.31.1",
      "ms-vscode.js-debug": "1.110.0",
      "ms-vscode.js-debug-companion": "1.1.3",
      "ms-vscode.vscode-js-profile-table": "1.0.10",
      "docker.docker": "0.18.0",
      "mechatroner.rainbow-csv": "3.24.1",
      "mhutchie.git-graph": "1.30.0",
      "ms-azuretools.vscode-containers": "2.4.1",
      "ms-azuretools.vscode-docker": "2.0.0",
      "ms-python.debugpy": "2025.18.0",
      "ms-python.python": "2026.4.0",
      "ms-python.vscode-pylance": "2026.1.1",
      "ms-python.vscode-python-envs": "1.22.0",
      "ms-toolsai.datawrangler": "1.24.0",
      "ms-toolsai.jupyter": "2025.9.1",
      "ms-toolsai.jupyter-keymap": "1.1.2",
      "ms-toolsai.jupyter-renderers": "1.3.0",
      "ms-toolsai.vscode-jupyter-cell-tags": "0.1.9",
      "ms-toolsai.vscode-jupyter-slideshow": "0.1.6",
      "ms-vscode-remote.remote-containers": "0.447.0",
      "ms-vscode-remote.remote-ssh": "0.122.0",
      "ms-vscode-remote.remote-ssh-edit": "0.87.0",
      "ms-vscode-remote.remote-wsl": "0.104.3",
      "ms-vscode.cpp-devtools": "0.3.6",
      "ms-vscode.cpptools-extension-pack": "1.5.1",
      "ms-vscode.cpptools-themes": "2.0.0",
      "ms-vscode.hexeditor": "1.11.1",
      "ms-vscode.remote-explorer": "0.5.0",
      "ms-vscode.vscode-serial-monitor": "0.13.1",
      "mshr-h.veriloghdl": "1.22.2",
      "pbkit.vscode-pbkit": "0.0.8",
      "rjyoung.vscode-modern-vhdl-support": "1.0.6",
      "trond-snekvik.gnu-mapfiles": "1.1.0"
    }
  }
}

Some folder and naming information has been removed but that's it.

Cheers,

Alberto

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

Benjamin — Mon, 16 Mar 2026 09:16:34 GMT

My mistake, this is for the Debug option not the Flash option. My guess is that this comes from a new update of the extension. I will check with the team, could you share the support information as shown in the attachment?

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

albert_1977 — Mon, 16 Mar 2026 08:44:39 GMT

No luck with "snr", I added it to the "launch.json" file but I still get the prompt to select. This happened also after I restarted VS Code with the new settings:

Cheers,

Alberto

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

Benjamin — Mon, 16 Mar 2026 08:25:47 GMT

Hi,
This should be possible. Try filling in the snr field in launch.json. Please see:

How to customize launch and debug configurations

Custom launch and debug configuration fields

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

albert_1977 — Mon, 16 Mar 2026 00:46:07 GMT

>nrfutil device list
001E000C5553500C20393256
Product STLINK-V3
Ports COM4
Traits serialPorts, usb

603005698
Product J-Link
Traits usb, jlink, seggerUsb

Supported devices found: 2

This is ok, I have both devices connected. I'd just like to have the J-Link as default when flashing and not having to select it each time.

Also, both nrfprog and nrfutil are installed. As far as I know, I'm working with nrf connect SDK v3.11, but I can't find where to check the version.

Thanks for your help so far.

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

Benjamin — Fri, 13 Mar 2026 07:50:11 GMT

Could you do nrfutil device list and paste the output?

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

Benjamin — Fri, 13 Mar 2026 07:48:29 GMT

Hi,

I was able to reproduce the issue, V9.14a is the earliest version where it appears. It does not seem to affect the actual functionality. Please note that this occurs only when using nrfjprog, not nrfutil, which is the current supported tool. The nrfjprog tool was removed as of nRF Connect SDK v2.8.0.

Anyways, thanks for the reports! I will forward it internally.

Best regards,
Benjamin

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

ct0 — Fri, 13 Mar 2026 05:18:29 GMT

I can confirm this issue is happening with v9.26, and doesn't happen with older v8.x versions.

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

albert_1977 — Thu, 12 Mar 2026 13:34:35 GMT

So, I downgraded to v8.20 which is 1 year old, that doesn't show the error message anymore.

I still get both debuggers showing in VS Code however, and each time I need to choose which one I can use:

Is there a way for the flasher to remember which one it uses by default?

Thanks for your help so far.

Cheers,

Alberto

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

albert_1977 — Thu, 12 Mar 2026 13:27:03 GMT

Hi Benjamin,

It's with version 9.26. I will try an older version.

Cheers,

Alberto

RE: VS Code: SeggerBackend jlinkarm.dll reported error at line ...

Benjamin — Thu, 12 Mar 2026 13:12:30 GMT

Hi Alberto,
What JLink version do you see this at? Do you still get the error messages if you downgrade?

Best regards,
Benjamin