Windows MSU Patch Installation Fails at 94% Post-Restart with "Undoing Changes" – No Errors in CBS Logs (Tried DISM Extraction & Step-by-Step Install)

I'm encountering an issue installing a Windows MSU patch (e.g., KBXXXXXXX) using WUSA on Windows 10. The initial installation phase completes successfully, but after restarting, the post-install phase reaches 94% on the blue screen and fails with the message: We couldn't complete the updates. Undoing changes. Don't turn off your computer. The system then reverts, and the update isn't applied. No obvious errors in CBS.log, WindowsUpdate.log, or SetupAPI.dev.log. I've enabled verbose logging and used Get-WindowsUpdateLog to check ETL files, but nothing points to the cause. This happens consisten

Question by Sarang M K on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.