Windows 11 in-place upgrade from 24H2 to 25H2 consistently fails with error 0x8007042B – 0x2000D during the SAFE_OS / MIGRATE_DATA phase

Question

Windows 11 in-place upgrade from 24H2 to 25H2 consistently fails with error 0x8007042B – 0x2000D during the SAFE_OS / MIGRATE_DATA phase.

The issue is reproducible across multiple devices. Removing the December 2025 and January 2026 cumulative updates allows the upgrade to complete successfully.

Requesting confirmation of a known servicing or upgrade compatibility issue and guidance on supported remediation.

Answer 1

Hi Milanne,

Could you share Setupact.log and Setuperr.log via OneDrive or Google Drive so I can check what is wrong? The path is

C:$Windows.~BT\Sources\Panther

I’m eager to hear back and work together to find a solution.

Answer 2

The error 0x8007042B – 0x2000D during the SAFE_OS / MIGRATE_DATA phase of an in-place upgrade from Windows 11 version 24H2 to 25H2 may indicate a compatibility issue with certain updates. While the specific error you are encountering is not directly mentioned in the provided context, it is noted that issues can arise during upgrades, and removing specific cumulative updates has allowed some users to complete the upgrade successfully.

For remediation, it is advisable to ensure that your system is fully updated and to check for any known issues related to the cumulative updates you mentioned. You may also want to consider temporarily uninstalling those updates if they are causing the upgrade to fail, as you have already discovered that this allows the upgrade to complete. Additionally, monitoring the official Microsoft documentation for updates on known issues and resolutions can provide further guidance.

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References:

• Windows 11, version 25H2 known issues and notifications