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Recent Windows Update Causes UNSUPPORTED_PROCESSOR Blue Screens

Microsoft has confirmed that this week’s August 2023 preview update is causing blue screen with error code “UNSUPPORTED_PROCESSOR”.

Blue screen of death with UNSUPPORTED_PROCESSOR stop code. Credit: Microsoft Learn.

The updates causing the issue are KB5029351 and KB5029331 for Windows 11 and Windows 10 respectively. This update also introduced, aside from blue screens, Search app fixes for Windows 11 and a new Backup app for Windows 10. Affected platforms include Windows 10 21H2/22H2 and Windows 11 22H2.

Redmond (Microsoft’s headquarters in Redmond, Washington, USA) said the following regarding the recent blue screens: “Microsoft has received reports of an issue in which users are receiving an ‘UNSUPPORTED_PROCESSOR’ error message on a blue screen after installing updates released on August 2… [problematic cumulative updates] might automatically uninstall to allow Windows to start up as expected.”

Users who have experienced the issue have reported that after a few reboots, their systems automatically rolled back the most recent update – solving the issue for the short term.

Microsoft is currently investigating the issue to determine whether the problem stems from a Microsoft-related cause.

Microsoft is also urging users who encounter this blue screen error to file a report using the Feedback Hub.

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