Preview update KB5029351 causes an "UNSUPPORTED_PROCESSOR" BSOD - [Windows 11]

Maxstar · Aug 26, 2023

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 22, 2023 (KB5029351) and then restarting their device. KB5029351 might automatically uninstall to allow Windows to start up as expected. If this occurs, we recommend that you do not attempt to reinstall KB5029351!

Status	Originating update	History
Mitigated	OS Build 22621.2215 KB5029351 2023-08-22	Last updated: 2023-08-25, 17:21 PT (Opened: 2023-08-23, 19:44 PT)

Sources:
Windows 11, version 22H2 known issues and notifications

https://www.reddit.com/r/Windows11/comments/15ybvgn/_/jxg6kad

https://www.reddit.com/r/Windows11/comments/15ybvgn/_/jxg4y04

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Preview update KB5029351 causes an "UNSUPPORTED_PROCESSOR" BSOD - [Windows 11]

Maxstar

Windows Update Moderator, Security Analyst