Windows 11 KB5029351 update is causing devices to crash with the Blue Screen of Death error “UNSUPPORTED_PROCESSOR.” This issue is specifically affecting supported PCs with MSI motherboards. It is worth noting that one user mentioned that this could be related to a new BIOS update released by MSI.

In response to these reports, Microsoft is actively investigating to determine the cause of the issue, whether it is related to the Windows update or another factor. Uninstalling the update has been reported to resolve the problem for affected users.

The Blue Screen of Death, commonly referred to as BSOD, appears when something goes wrong with Windows, prompting the system to crash in order to protect the installation, files, and apps. In this case, users are encountering the “UNSUPPORTED_PROCESSOR” error after Windows boots for KB5029351.

Multiple users have confirmed experiencing the Windows 11 BSOD “UNSUPPORTED_PROCESSOR” after installing the August 2023 optional patch. For instance, one user with an Intel 13th generation processor and a Z690 motherboard mentioned that their device fails to boot, displaying the “UNSUPPORTED_PROCESSOR” stop code. However, it is important to note that not all MSI boards are affected by this issue, and it is possible that it may be related to the MSI BIOS update. Feedback from users suggests that the update automatically rolls back after encountering the blue screen error.

One user highlighted that the KB5029351 update caused their PC to experience BSOD during boot, displaying the “UNSUPPORTED_PROCESSOR” error. After several reboots, the update rolled back to the previous version. Another user mentioned that the “unsupported processor” error occurred after the update and their computer reverted to the older version of Windows. This problem seems to mainly affect Intel’s 13th-generation processors.

Another report indicates issues with an i7-13700K processor and MSI Z790-P DDR4 WIFI setup.

If you encounter the “Stop Code: Unsupported Processor” caused by the August update and find yourself stuck on the blue screen, you can try the following steps to resolve the issue:
1. Force shutdown the PC.
2. Hold the power button again to force another shutdown when you see the Windows logo.
3. Repeat this process 2-3 times to enter Automatic Repair mode.
4. In the Automatic Repair screen, select Troubleshoot > Advanced options.
5. To launch the terminal in the blue environment, select Command Prompt from the Advanced options screen.
6. In the Command Prompt, type the following command: wusa /uninstall /kb:KB1234567.
7. Restart the device.

It is worth mentioning that users did not report these problems when testing the update in the Windows Insider Program. Additionally, the issue is not observed in Windows 11’s August 2023 Patch Tuesday update, which addressed SSD issues.

It is possible that changes made by Microsoft to the update when releasing it to the public could be causing these issues, or there may be another underlying cause. If you are using an MSI motherboard, it might be wise to wait before installing the optional update.

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