Windows 10/11: UNSUPPORTED_PROCESSOR error caused by preview updates (August 22, 2023)

Windows[German]The old recommendation not to install a month's preview updates immediatly has proven itself again in August 2023. The optional preview updates released on August 22, 2023 are supposed to fix numerous bugs and provide new group policies in Windows 11 for the update installation. But Microsoft had to admit that the updates cause an UNSUPPORTED_PROCESSOR BlueScreen on some machines. The updates were therefore withdrawn for some machines.


Advertising

Windows 10/11 preview updates August 2023

Microsoft has released preview updates for Windows 10 22H2 (KB5029331), Windows 11 21H2 (KB5029332), and Windows 11 22H2 (KB5029351) as of August 22, 2023. I've described the details in the August 22, 2023 blog posts linked at the end of the article. Among other things, optional update KB5029351 introduces a new Group Policy to manage the installation of optional updates (see Windows 11 22H2: Microsoft allows control optional update installation via group policy). For Windows 10 22H2, preview update KB5029331 introduces a new backup feature for apps (see Windows 10 22H2 Preview Update KB5029331 (August 22, 2023)).

UNSUPPORTED_PROCESSOR error (BlueSceen)

I've already been alerted by blog reader EP (thanks) that Microsoft is currently investigating issues that the August 22, 2023 optional preview updates to Windows 10 and Windows 11 are triggering the UNSUPPORTED_PROCESSOR error including BlueScreen on some systems.

At the Windows Release Health page, for all Windows versions provided with Preview Updates, you can now find the support article Microsoft received reports about an "UNSUPPORTED_PROCESSOR" error in the Known Issues sections.

Microsoft writes that they have received reports where users get a blue screen error message "UNSUPPORTED_PROCESSOR"  as soon as they install one of the optional preview updates for:

  • Windows 10 22H2 (KB5029331)
  • Windows 11 21H2 (KB5029332)
  • Windows 11 22H2 (KB5029351)

It is said that the BlueScreen occurs after the reboot for the new installation and that this faulty update may then be uninstalled automatically (by the automatic repair) so that Windows can be started as expected. Corresponding reports about the BlueScreen can be found on reddit.com in this thread, for example:


Advertising

This update made my PC BSOD at boot. Error code "UNSUPPORTED_PROCESSOR". It automatically rolled back the update to 22621.2134 after a few reboots. So beware.

Specs: Intel Core i9-13900K on a MSI PRO Z690-A DDR4 with newest BIOS (7D25v1D)

—-

Same error for me as well with a 13700K and a MSI Pro Z790-A with the newest BIOS (7E07vA6).

Definitely seems like a pattern here that you, me, and u/Educational_Tooth197 all have 13th gen processors with MSI boards running the newest BIOS for each of our different boards and we all got an unsupported processor error.

—-

I'm also getting BSOD with UNSUPPORTED_PROCESSOR on a 13900KS and MSI MPG Z690 CARBON WIFI with latest BIOS (7D30v1D).

There are other confirmations and this thead on reddit.com contains more posts. Windows Latest lists more cases here. Different systems (some with MSI boards) and different CPUs are affected. The problem is also described in the Microsoft Answers forum thread Unsupported_Processor Error When Attempting to Enter Safe Mode or use a Boot USB as of August 12, 2023, but could be fixed there via BIOS update.

I previously assumed that optional preview updates on unmanaged systems were only installed manually, at user request. That no longer seems to be true, as comments here on the blog suggest. For these users, the August 22, 2023 preview update was installed automatically.

Microsoft is currently investigating this issue and will release more information in due course. Affected users are advised to post a corresponding message in the Feedback Hub. For affected systems that have telemetry enabled, Microsoft has likely withdrawn the update.

Similar articles:
Microsoft Security Update Summary (August 8, 2023)
Patchday: Windows 10 Updates (August 8, 2023)
Patchday: Windows 11/Server 2022 Updates (August 8, 2023)
Windows 7/Server 2008 R2; Server 2012 R2: Updates (August 8, 2023)
Microsoft Office Updates (August 8, 2023)
Exchange Server Security Updates (August 8, 2023)

Windows 11 22H2: Preview Update KB5029351 (August 22, 2023)
Windows 11 21H2: Preview-Update KB5029332 (August 22, 2023)
Windows 10 22H2 Preview Update KB5029331 (August 22, 2023)


Cookies helps to fund this blog: Cookie settings
Advertising


This entry was posted in issue, Update, Windows and tagged , , , . Bookmark the permalink.

6 Responses to Windows 10/11: UNSUPPORTED_PROCESSOR error caused by preview updates (August 22, 2023)

  1. EP says:

    guenni

    motherboard maker MSI has issued a statement regarding the UNSUPPORTED_PROCESSOR error (BlueSceen) {for Win11 only though}
    https://www.msi.com/news/detail/MSI-On–UNSUPPORTED-PROCESSOR–Error-Message-of-Windows-11-Update-KB5029351-Preview-142215

  2. EP says:

    follow-up 8/26

    https://www.neowin.net/news/microsoft-puts-little-blame-on-its-windows-update-after-unsupported-processor-bsod-bug/

    Microsoft has recently changed their tune in that the KB5029351 win11 & KB5029331 win10 updates do NOT cause the UNSUPPORTED PROCESSOR error:
    https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-22h2#3149msgdesc
    https://learn.microsoft.com/en-us/windows/release-health/status-windows-10-22h2#3149msgdesc

    "Next steps: After investigating these reports, we have found that the "UNSUPPORTED_PROCESSOR" error was not caused by issues in KB5029351 and is limited to a specific subset of processors. We are collaborating with device manufacturers (OEMs) and will temporarily mitigate this issue by not offering KB5029351 to Windows devices that might be affected by this issue. If you still experience this issue, please contact your device's processor manufacturer."

    "Next steps: After investigating these reports, we have found that the "UNSUPPORTED_PROCESSOR" error was not caused by issues in KB5029331 and is limited to a specific subset of processors. We are collaborating with device manufacturers (OEMs) and will temporarily mitigate this issue by not offering KB5029331 to Windows devices that might be affected by this issue. If you still experience this issue, please contact your device's processor manufacturer."

Leave a Reply

Your email address will not be published. Required fields are marked *