Create troubleshoot-windows-update-error-0x800f0920.md

Author: ryanberg-aquent

support/windows-server/installing-updates-features-roles/troubleshoot-windows-update-error-0x800f0920.md

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+---
+title: Troubleshoot Windows Update Error 0x800f0920
+description: Learn how to resolve Windows Update error 0x800f0920, caused by a hang in the Trusted Installer service.
+manager: dcscontentpm
+audience: itpro
+ms.date: 11/11/2025
+ms.topic: troubleshooting
+ms.reviewer: scotro, mwesley, jarretr, v-ryanberg, v-gsitser
+ms.custom:
+- sap:windows servicing,updates and features on demand\Windows Update - Install errors starting with 0x800F (CBS E)
+- pcy:WinComm Devices Deploy
+appliesto:
+  - <a href=https://learn.microsoft.com/windows/release-health/windows-server-release-info target=_blank>Supported versions of Windows Server</a>
+---
+
+# Troubleshoot Windows Update error 0x800f0920
+
+**Applies to:** :heavy_check_mark: Windows VMs
+
+## Summary
+
+Error code 0x800f0920 indicates a hang was detected during the Windows Update installation process. This issue arises when the Trusted Installer service doesn't complete the installation within the default timeout period of 15 minutes.
+
+## Prerequisites
+
+For virtual machines (VMs) running Windows in Azure, make sure that you back up the OS disk. For more information, see [About Azure Virtual Machine restore](/azure/backup/about-azure-vm-restore).
+
+## How to identify the issue
+
+Check the `CBS.log` for entries similar to the following ones:
+
+```output
+2023-09-17 22:48:16, Info                  CBS    Startup: SC autostart event signaled
+2023-09-17 22:48:16, Info                  CBS    Clearing HangDetect value
+2023-09-17 22:48:16, Error                 CBS    Startup: A possible hang was detected on the last boot. [HRESULT = 0x800f0920 - CBS_E_HANG_DETECTED]
+2023-09-17 22:48:16, Info                  CBS    Current global progress. Current: 58, Limit: 105, ExecuteState: CbsExecuteStateResolvePending
+2023-09-17 22:48:16, Info                  CBS    Previous global progress. Current: 58, Limit: 105, ExecuteState: CbsExecuteStateResolvePending
+2023-09-17 22:48:16, Error                 CBS    Startup: No progress detected while needing to process the advanced operation queue, rolling back and cancelling the transaction. [HRESULT = 0x80004005 - E_FAIL]
+2023-09-17 22:48:16, Info                  CBS    Setting ExecuteState key to: CbsExecuteStateInitiateRollback | CbsExecuteStateFlagAdvancedInstallersFailed
+2023-09-17 22:48:16, Info                  CBS    SetProgressMessage: progressMessageStage: -1, ExecuteState: CbsExecuteStateInitiateRollback | CbsExecuteStateFlagAdvancedInstallersFailed, SubStage: 0
+2023-09-17 22:48:16, Info                  CBS    Progress: UI message updated. Operation type: Update. Stage: 1 out of 1. Rollback.
+2023-09-17 22:48:16, Info                  CBS    Setting original failure status: 0x800f0920, last forward execute state: CbsExecuteStateResolvePending
+```
+
+## Root cause
+
+The error occurs because the Trusted Installer service doesn't finish the installation process within the default timeout period of 15 minutes. This can lead to a rollback and cancellation of the transaction.
+
+## Resolution
+
+For Windows-based computers, perform an [in-place upgrade](/windows-server/get-started/perform-in-place-upgrade#perform-the-in-place-upgrade). 
+
+For VMs running Windows in Azure, see [in-place upgrade on the Windows virtual machine](/azure/virtual-machines/windows-in-place-upgrade).
+