Microsoft fixes File History backup failures caused by September Windows updates
Summary
September 2026 Windows security updates disrupted File History backups and restores on some systems. Microsoft says optional updates fix the issue for Windows 11; other users can get the fix in the October 13 Patch Tuesday release.
Key points
- Affected users experienced File History backup and restore failures, stale backup timestamps, and false “Reconnect your drive” alerts.
- Event Viewer showed crash events involving FileHistory.exe and KERNELBASE.dll.
- Impacted systems included Windows 10 and Windows 11 versions listed by Microsoft.
- Microsoft says optional updates KB5124006 and KB5124010 fix the issue for Windows 11 26H1 and 24H2/25H2, respectively.
- Users who do not install the optional updates are scheduled to receive the fix in the October 13 Patch Tuesday updates.
Article Details
- Event Type
- Microsoft fixed a Windows File History backup and restore issue caused by the September 2026 security updates.
- Impact
- Some affected Windows 10 and Windows 11 systems could not create or update File History backups or restore files, showed false drive-reconnection alerts and missing previous-version information, and logged crashes involving FileHistory.exe and KERNELBASE.dll. Microsoft released fixes in optional Windows 11 preview updates KB5124006 and KB5124010; the fix is scheduled for the October 13 Patch Tuesday release for users who do not install the optional updates.
Vendors
Products
File HistoryMicrosoft has fixed a known issue that caused File History backups to fail on some Windows systems after the September 2026 security updates.Windows 10Some Windows 10 and Windows 11 users received false “Reconnect your drive” alerts.Windows 11Some Windows 10 and Windows 11 users received false “Reconnect your drive” alerts.