Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

RE: Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

Xant — Mon, 02 Feb 2026 11:33:46 GMT

Keep default options, not working. (default: "Install for all users")

With "Install for this user only" it works now.

RE: Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

Maria Gilje — Mon, 02 Feb 2026 09:07:30 GMT

Hello,

Thank you for sharing your output.

The team let me know that the reason for the extension not finding J-Link when starting a debugging session is that there is no InstallPath in the blob for CURRENT_USER. The extension expects there to be an InstallPath for the blob, so it does not use the fallback of LOCAL_MACHINE.

Could you please try the following:

In VS Code, open the command palette (Ctrl+Shift+P)
Find and select the "nRF Connect: Download and Install SEGGER J-Link" command.
When the pop-up appears, select that you want to install SEGGER J-Link.
Keep the default options in the installation wizard.

After completing the installation, there should be an InstallPath for the CURRENT_USER blob when running reg query HKEY_CURRENT_USER\Software\SEGGER\J-Link again.

Since the team is now aware of the fallback not working in all cases, they are working on fixing this in an upcoming release of the extension. Thank you for the report!

Best regards,

Maria

RE: Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

John W0 — Thu, 29 Jan 2026 18:55:43 GMT

I also had this problem, with build 2026.1.1327. I downgraded to 2025.12.1228 and was able to debug properly.

RE: Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

Xant — Tue, 27 Jan 2026 08:14:16 GMT

[quote userid="116814" url="~/f/nordic-q-a/126479/unable-to-start-debugging-with-latest-nrf-connect-for-vs-code-extension-windows/559479"]reg query HKEY_CURRENT_USER\Software\SEGGER\J-Link[/quote]

HKEY_CURRENT_USER\Software\SEGGER\J-Link
    StartMinimized    REG_DWORD    0x1
    StayOnTop    REG_DWORD    0x1
    LogIsHalted    REG_DWORD    0x1
    LogInternal    REG_DWORD    0x1
    OverrideConfigFile    REG_DWORD    0x0
    OverrideLogFile    REG_DWORD    0x0
    ConfigFile    REG_SZ
    LogFile    REG_SZ
    DontShowAgainUnlockSTM32    REG_DWORD    0x1
    NotifyOnSecurityUpdate    REG_DWORD    0x0
    UpdateNotificationMode    REG_DWORD    0x0
    DontShowAgainUnlockNordicNRF52    REG_DWORD    0x1
    LogRegWrite    REG_DWORD    0x0
    LogRegRead    REG_DWORD    0x0
    LogMemWrite    REG_DWORD    0x1
    LogMemRead    REG_DWORD    0x1
    LogBPSet    REG_DWORD    0x0
    LogBPClr    REG_DWORD    0x0
    LogStep    REG_DWORD    0x1
    LogGo    REG_DWORD    0x1
    LogHalt    REG_DWORD    0x1
    LogPowerUp    REG_DWORD    0x0
    LogIndention    REG_DWORD    0x0
    LogReset    REG_DWORD    0x1
    LogOther    REG_DWORD    0x0
    DontShowAgainUnlockSTM    REG_DWORD    0x1

HKEY_CURRENT_USER\Software\SEGGER\J-Link\DontShowAgain

[quote userid="116814" url="~/f/nordic-q-a/126479/unable-to-start-debugging-with-latest-nrf-connect-for-vs-code-extension-windows/559479"]reg query HKEY_LOCAL_MACHINE\Software\SEGGER\J-Link[/quote]

HKEY_LOCAL_MACHINE\Software\SEGGER\J-Link
    InstallPath    REG_SZ    C:\Program Files\SEGGER\JLink_V876
    CurrentVersion    REG_DWORD    0x15630

RE: Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

Maria Gilje — Fri, 23 Jan 2026 14:43:00 GMT

This could be related to if J-Link is installed globally or per user. The installation is expected to be global or for it to be registered in the Windows registry. What is returned from the following commands in your command line?

reg query HKEY_CURRENT_USER\Software\SEGGER\J-Link

and

reg query HKEY_LOCAL_MACHINE\Software\SEGGER\J-Link

Best regards,

Maria

RE: Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

Maria Gilje — Fri, 23 Jan 2026 13:07:49 GMT

Thank you! I have forwarded this internally.

Best regards,

Maria

RE: Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

Xant — Fri, 23 Jan 2026 09:06:01 GMT

// 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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}

RE: Unable to start debugging with latest "nRF Connect for VS Code" Extension (Windows)

Maria Gilje — Tue, 13 Jan 2026 12:38:34 GMT

Hello,

Could you please generate support information for your extension so the responsible team for the extension can take a look?

Best regards,

Maria