OmniMend
Match Microsoft's File History incident
The narrow match is a Windows 11 24H2 or 25H2 PC with KB5124008 installed, followed by failed File History backups or restores to an external drive or network location. Microsoft also names a false Reconnect your drive message when the configured destination is available.
| What you see | How it fits | Next check |
|---|---|---|
| Reconnect your drive appears even though the configured drive or network location is available | Matches the false-warning case fixed by KB5124010. | Confirm Windows 11 version, KB5124008, and the same configured destination. |
| File History fails to back up to or restore from an external or network destination after KB5124008 | Matches Microsoft's backup-or-restore boundary. | Preserve the destination and install the applicable corrective update. |
| The drive is absent from File Explorer, disconnected, locked, or failing elsewhere | This may be a real destination or hardware problem. | Stop treating the warning as false and diagnose the connection or drive. |
| The PC runs Windows 11 26H1 or another Windows version | KB5124010 is not the package for that version. | Use the matching Windows release-health and update history pages. |
Preserve the current destination and history
Record the configured File History destination, whether it is an external drive or network location, its drive letter or network path, and the last successful backup time shown before the incident. Photograph or capture the current warning without exposing filenames, account names, server names, or other private data.
Do not use Select drive to replace a destination that still contains the only backup history. Do not rename, move, merge, or delete the FileHistory folder. If the external drive clicks, disconnects, reports unreadable data, becomes unusually hot, or disappears from Disk Management, stop writing to it and deal with the drive condition first.
Confirm the Windows version and updates
Open Settings > System > About and record the Windows specification. The Microsoft fix discussed here applies to Windows 11 24H2 and 25H2. Then open Settings > Windows Update > Update history and check for KB5124008.
Do not download a package because its KB number looks close. Windows version, processor architecture, and the installed update path must match. If the PC is managed by an employer or school, let its administrator control the update schedule.
Install KB5124010 through Windows Update
As of September 25, 2026, Microsoft lists KB5124010 as an optional preview update for Windows 11 24H2 and 25H2. Open Settings > Windows Update > Advanced options > Optional updates, select the applicable update, install it, and restart when prompted.
After the restart, return to Update history and record KB5124010 plus the OS build. Microsoft lists builds 26100.9550 for 24H2 and 26200.9550 for 25H2. A later supported cumulative update may include the same fix, so follow Windows Update and the current Microsoft release notes if KB5124010 is no longer offered separately.
If Windows Update itself is stalled, use the Windows 11 update guide to record the phase and error before attempting a repair. Do not uninstall KB5124008 merely to make the File History warning disappear.
Prove that a new backup completes
Reconnect the same known destination and open File History. Use Run now once. Record the start time, completion message, latest backup time, destination, and any error. Leave the destination connected until File History finishes.
A cleared banner or newer timestamp proves only that this run reached a completion state. It does not prove that the stored copy is readable. Keep the destination unchanged and run the separate restore check.
Restore one harmless test copy elsewhere
Choose a small, non-sensitive file that you can open and that has a known prior version. In File Explorer, right-click its original folder or file, choose Restore previous versions, inspect the available File History version, and use Restore to so the copy goes to a separate test folder. Do not overwrite the current file.
Open the restored copy and compare it with the expected content. Record the version time, restore location, whether the file opened, and whether it matched. Only this backup-plus-restore result tests both directions. Delete the test copy later if it contains no needed data; leave the original history alone.
If Reconnect your drive remains
One current update and one controlled retest are enough. If the warning or failure remains, preserve the exact message and separate it from the September incident. Check whether the destination appears consistently, the cable or port works with another non-critical device, the network path opens under the expected account, storage is available, encryption is unlocked, and permissions have not changed.
A different failure may involve the drive, cable, USB bridge, network, credentials, permissions, encryption, disk health, or older File History state. Do not reset File History or erase the destination to test a theory. If cloud files are missing or stale instead, use the OneDrive sync guide; File History and cloud sync are separate systems.
Where OmniMend fits
Windows Update and File History provide the direct fix and proof steps. OmniMend cannot install KB5124010, read or create a File History backup, inspect the backup destination, restore files, repair a drive, or guarantee recovery.
On a supported Windows 10 or 11 x64 PC, OmniMend can organize broader local system, event, update, storage, and configuration evidence when the File History symptom is part of a larger Windows problem. Diagnosis is read-only. Any supported repair inside OmniMend requires approval and a result check.
For that separate evidence record, review OmniMend's diagnostic scope or download OmniMend. Keep private filenames, backup contents, account details, and network paths out of shared reports.
Editorial sources
Checked September 25, 2026 against Microsoft Support's KB5124010 release notes, KB5124008 release notes, File History backup and restore guide, and ordinary reconnect guidance. Microsoft supplies the affected Windows versions, corrected builds, incident boundary, optional-update path, and supported restore controls. Current reports informed the persistent-error boundary only. OmniMend added the evidence record, data-preservation limits, backup-and-restore proof, and product boundary. No source shows that KB5124010 repairs every File History problem or guarantees recovery of stored files.