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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    "os": "win32",
    "osVersion": "Windows 11 Home",
    "osKernel": "10.0.26100",
    "vscode": "1.96.4",
    "electron": "32.2.6",
    "node": "v20.18.1"
  },
  "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"
  },
  "workspace": {
    "name": "record_launch_app",
    "workspaceFile": null,
    "folders": [
      "d:\\ncs\\v2.8.0\\nrf\\samples\\nfc\\record_launch_app"
    ]
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  "sdks": [
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      "path": "d:\\ncs\\v2.8.0"
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  "activeBuild": "d:\\ncs\\v2.8.0\\nrf\\samples\\nfc\\record_launch_app\\build",
  "apps": [
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      "uri": "d:\\ncs\\v2.8.0\\nrf\\samples\\nfc\\record_launch_app",
      "buildConfigurations": [
        {
          "id": "d:\\ncs\\v2.8.0\\nrf\\samples\\nfc\\record_launch_app\\build",
          "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",
      "path": "c:\\ncs\\toolchains\\2d382dcd92"
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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"
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  "config": {
    "nordic-semiconductor.nrf-connect": {
      "topdir": "",
      "toolchain": {
        "path": ""
      },
      "ozonePath": "",
      "applications": [],
      "applicationOptions": {},
      "kconfig": {
        "interface": "kconfig"
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      "west": {
        "env": {
          "$base": "terminal"
        }
      },
      "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
      },
      "nrfutil": {
        "home": null
      },
      "defaultOpenAction": "ask",
      "terminalProfile": {
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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.

[SoldOutYungLean]

Okay so the fix was as Simonr suggested:

You have to delete your "C:\USER\\.pyenv\\pyenv-win\\shims" folder.

When I did that, I got a new error, saying that I didn't have nrfutil, despite pip installing it. The fix was to manually install nrfutil from here:
https://www.nordicsemi.com/Products/Development-tools/nRF-Util/Download#infotabs. Make sure you remember the path you install it at.
(More info here: RE: FATAL ERROR: required program nrfutil not found; install it or add its location to PATH)

When I did that a new error related to not having "device" showed up. I then had to run the command
"PATH_TO_NRF_UTIL install device"

And now it is fixed. I used a Windows 11 machine. There would've been more steps if I had used a mac or linux.

[GilDev]

Hi, I have no .pyenv folder, is there another official fix?

[eminosyan]

Hi! I fixed that, by following next steps.
1. I have deleted the floder "C:\Users\USER_NAME\AppData\Local\Programs\Python\"Python_Ver"\Lib\site-packages\"nrfultil-xxx" " (entire folder)
2. After that, i have tried again and get error, that i have no nrfutil installed. To fix that, i download nrfutil from link below and placed this ".exe" file to "C:\ncs\toolchains\"hash"\opt\bin\Scripts". Then you need to open the folder in Terminal (powershell, cmd) and type ".\nrfutil.exe install device".
3. Restart VS Code, and now it should work

[garrettb]

I am getting this error now as well, and have tried your fix above. Why are things so murky and complicated?

One day everything works, then next day all development grinds to a halt.

Please can someone offer some practical steps so I can get going again?

I don't have a .pyenv folder. I did just delete the nrfutil folder in C:\Users\USER_NAME\AppData\Local\Programs\Python\"Python_Ver"\Lib\site-packages, and downlaod nrfutisl and re-install etc. I am guessing things are even more messed up now. 

Urgently need to get back developing, so any help appreciated.

[GilDev]

If I remember correctly, my issue was having other Zephyr projects not related to Nordic, and have all of that kind of in the same “workspace” or directory. It used by default the folder names “zephyr” which had a different version than the one from my Nordic projects, there also was a .west hidden directory that messed things up.

I reinstalled my projects in separate directories, each with its own Zephyr (or ncs in C:\ for Nordic projects) and it stopped giving me errors.

[garrettb]

I think it is an nrfutils issue.
I am trying to flash an nRF54, and I think this might be the first time (previously I have been using nRF53/52 etc.).
I downloaded the latest nrfutil.exe, moved it to a different folder: C:\Program Files\Nordic Semiconductor
Then included this folder in the PATH.
Then as suggested, I opened a command window and typed:

nrfutil self-upgrade

Here is the output

C:\ncs\v2.9.0>
C:\ncs\v2.9.0>nrfutil self-upgrade
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "C:\Users\me\AppData\Local\Programs\Python\Python311\Scripts\nrfutil.exe\__main__.py", line 4, in <module>
File "C:\Users\me\AppData\Local\Programs\Python\Python311\Lib\site-packages\nordicsemi\__main__.py", line 53, in <module>
from nordicsemi.dfu.dfu_transport_serial import DfuTransportSerial
File "C:\Users\me\AppData\Local\Programs\Python\Python311\Lib\site-packages\nordicsemi\dfu\dfu_transport_serial.py", line 52, in <module>
from nordicsemi.lister.device_lister import DeviceLister
File "C:\Users\me\AppData\Local\Programs\Python\Python311\Lib\site-packages\nordicsemi\lister\device_lister.py", line 39, in <module>
from nordicsemi.lister.windows.lister_win32 import Win32Lister
File "C:\Users\me\AppData\Local\Programs\Python\Python311\Lib\site-packages\nordicsemi\lister\windows\lister_win32.py", line 43, in <module>
from constants import DIGCF_PRESENT, DEVPKEY, DIGCF_DEVICEINTERFACE
ModuleNotFoundError: No module named 'constants'

[garrettb]

Problem solved: Just typing this out in case anybody else has the same issue.

This was an nrfutil issue, which only arose because this was my first time trying to flash an nRF54 device. As stated above, I downloaded the latest nrfutil.exe, moved it to a a different folder: C:\Program Files\Nordic Semiconductor
Then included this folder in the PATH.

Ina command window, I then typed 'nrfutil self-upgrade', but this did not work.

I then re-started my PC, as a way to force the PATH knowledge to be updated, then again, opened a command window, and 'nrfutil self-upgrade' worked. I also then entered 'nrfutil install device', not sure if this was required or not,

Then I opened VSCode and successfully flashed the device.

Along the way, I also updated my Python from 3.11 to 3.13.

So either or both of these fixes was what worked....