Feature Update 21H2 is failing

lalajee 1,811 Reputation points


I'm try to update machine from 1909 to 21H2 but its keep failing after the reboot.

I checked C:$WINDOWS.~BT\Sources\Panther\CompatData_xxx

file show no blockers

I tried following

  • Deleted C:\WINDOWS\SoftwareDistribution
  • Deleted C:\WINDOWS\System32\GroupPolicy
  • Run WMI Repaire
  • Run SFC
  • Run chkdsk

Which log file can I check to see why its failing to install

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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Microsoft Configuration Manager Deployment
Microsoft Configuration Manager Deployment
Microsoft Configuration Manager: An integrated solution for for managing large groups of personal computers and servers.Deployment: The process of delivering, assembling, and maintaining a particular version of a software system at a site.
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2 answers

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  1. S.Sengupta 14,436 Reputation points MVP

    The Windows Setup performance events are saved into a log file that is named Setup.etl, which is available in the %WINDIR%\Panther directory of all installations.

    Kindly go through the following Microsoft reference article:

    Windows upgrade log files

  2. AllenLiu-MSFT 38,016 Reputation points Microsoft Vendor

    Hi, @lalajee

    Thank you for posting in Microsoft Q&A forum.

    In order to check which log files to view to understand why the 21H2 feature update is failing to install, you can follow the troubleshooting checklist provided by Microsoft here. Specifically, the checklist recommends checking the following log files for errors or issues:

    1. setuperr.log: This file is located in the %windir%\Panther directory and contains information about errors that occurred during the installation process.
    2. setupact.log: This file is also located in the %windir%\Panther directory and contains information about the installation process, including successful operations and warnings.
    3. Event Viewer: This tool can be accessed by typing "Event Viewer" in the Windows search bar. From there, you can navigate to the "Windows Logs" section and view the "Setup" and "System" logs for any errors or issues related to the installation process.
    4. WindowsUpdate.log: This file can be found in the %windir%\WindowsUpdate.log directory and contains information about Windows Update operations.

    If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Add comment".