Getting error "ImportError: Module use of python312.dll conflicts with this version of Python." when flashing - can build perfectly fine

[SoldOutYungLean]

I get the error "ImportError: Module use of python312.dll conflicts with this version of Python." when I try to flash my device using any Python version below 3.12.x. I get no error when I try to build the project.

However, when I set the global Python version to 3.12.0 using pyenv, it first and foremost correctly doesn't recognize the nrfutil package until I install it into the new version, which is a sign that it has correctly changed the version, but I also get a new error related to not having the package "constants." When I pip install that I get a third error:

versions\3.12.0\Lib\site-packages\nordicsemi\lister\windows\lister_win32.py", line 43, in <module>
    from constants import DIGCF_PRESENT, DEVPKEY, DIGCF_DEVICEINTERFACE
ImportError: cannot import name 'DIGCF_PRESENT' from 'constants' (C:\Users\DripTooHard\.pyenv\pyenv-win\versions\3.12.0\Lib\site-packages\constants.py)

Looking online, it seems like the fix to this issue is to downgrade to 3.8 or 3.9. But this just goes back to me having the original error.

I tried looking at the support information, and it seems like the toolchain is reffering to a Python 3.12.4 version?

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    "osVersion": "Windows 11 Home",
    "osKernel": "10.0.26100",
    "vscode": "1.96.4",
    "electron": "32.2.6",
    "node": "v20.18.1"
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  "system": {
    "date": "2025-01-30T15:19:16.999Z",
    "vscodeRoot": "d:\\DripTooHard\\Microsoft VS Code\\resources\\app",
    "nrfConnectForDesktopInstalled": true,
    "vscodeUptime": "00:12:00",
    "osUptime": "00:36:06",
    "cpu": "11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz"
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  "workspace": {
    "name": "record_launch_app",
    "workspaceFile": null,
    "folders": [
      "d:\\ncs\\v2.8.0\\nrf\\samples\\nfc\\record_launch_app"
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      "uri": "d:\\ncs\\v2.8.0\\nrf\\samples\\nfc\\record_launch_app",
      "buildConfigurations": [
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          "name": "build",
          "boardId": "nrf54l15dk/nrf54l15/cpuapp",
          "type": "Sysbuild",
          "isChild": false,
          "isStale": false,
          "taskBindings": {
            "build": [],
            "pristineBuild": [],
            "flash": [],
            "eraseAndFlash": []
          },
          "sdk": "d:\\ncs\\v2.8.0",
          "toolchain": "nRF Connect SDK Toolchain v2.8.0"
        }
      ]
    }
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      "version": "2.8.0",
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  "connectedDevices": [
    {
      "serialNumber": "001057733114"
    }
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    "C:\\Program Files\\SEGGER\\JLink_V794i\\JLink.exe": "7.94i",
    "C:\\Program Files\\Nordic Semiconductor\\nrf-command-line-tools\\bin\\nrfjprog.exe": "10.24.0",
    "C:\\Users\\DripTooHard\\.pyenv\\pyenv-win\\shims\\nrfutil": null,
    "C:\\ncs\\toolchains\\2d382dcd92\\cmake": "3.21.0",
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      "jlinkInfo": {
        "name": "JlinkARM",
        "version": "JLink_V7.94i",
        "versionFormat": "string"
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    },
    "nrfutil-toolchain-manager": {
      "version": "0.14.4",
      "binPath": "c:\\Users\\DripTooHard\\.vscode\\extensions\\nordic-semiconductor.nrf-connect-2025.1.127-win32-x64\\platform\\nrfutil\\bin\\nrfutil-toolchain-manager"
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  },
  "terminal": {
    "defaultProfile": "PowerShell"
  },
  "config": {
    "nordic-semiconductor.nrf-connect": {
      "topdir": "",
      "toolchain": {
        "path": ""
      },
      "ozonePath": "",
      "applications": [],
      "applicationOptions": {},
      "kconfig": {
        "interface": "kconfig"
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      "west": {
        "env": {
          "$base": "terminal"
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      },
      "boardRoots": [],
      "taskBindings": {},
      "buildTerminal": {
        "condensedProgress": true
      },
      "debugging": {
        "flash": true,
        "bindings": {},
        "justMyCode": false
      },
      "activeAppFollowActiveEditor": true,
      "flash": {
        "softreset": false,
        "erase": false,
        "recover": false
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      "enableTelemetry": false,
      "thirdpartyIntegration": {},
      "toolchainManager": {
        "indexURL": null,
        "installDirectory": null
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      "nrfutil": {
        "home": null
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      "defaultOpenAction": "ask",
      "terminalProfile": {
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    "nordic-semiconductor.nrf-terminal": {
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}

I am wondering if the fix would be to somehow change the python version in the toolchain, but I would like to hear first if you have any other suggestions? I have gone through my path and replaced all occurances of Python with a refference to 3.8.6, but once again, it appears that pyenv is correctly setting the right python versions, so this is most likely not a path issue.

[Simonr]

Hi

Are you using the VS Code extension for NCS here when seeing this issue? Have you tried removing the 3.12.x version(s) of Python from your computer altogether on your end so you only have versions 3.8 or 3.9 installed?

Also, since this is related to flashing a device only, can you share some information on what device you're trying to flash here, is it an nRF54L15 DK or custom board. If it's a DK, what version of the board do you have?

Best regards,

Simon

[SoldOutYungLean]

Hello Simon,

Yes I have tried removing the 3.12.x version of Python. It didn't work. It is indeed the VS code extension.

It is the nRF54L15DK, I am not quite sure how to read the information you're requesting from the board, but it has the following values on the sticker:

PCA10156
0.9.1
2024.45
1057733114

With that said, I do believe the issue is related to nrfutil more than the boaard itself.