KB5132061 (Build 26100.9974) causes INACCESSIBLE_BOOT_DEVICE — Startup Repair reports corrupted boot binary

Question

KB5132061 (Build 26100.9974) causes INACCESSIBLE_BOOT_DEVICE — Startup Repair reports corrupted boot binary

Shawn M 0

After installing the November 2026 Windows 11 update KB5132061, my computer became unbootable and displays INACCESSIBLE_BOOT_DEVICE.

My system:

Windows 11 24H2, build 26100.9974
Gigabyte MEG Z490 UNIFY motherboard
Intel Core i7-10700
Crucial MX500 1TB SATA SSD
BIOS storage mode: AHCI

Startup Repair repeatedly reports:

“A recently serviced boot binary is corrupted.”

DISM rollback using /Cleanup-Image /RevertPendingActions fails with error 0x800f082f (CBS_E_EXCLUSIVE_WOULD_MERGE), reporting that the servicing session is frozen.

The November update package is shown as Install Pending. The October cumulative update KB5127648 (build 26100.9711) is shown as Uninstall Pending.

Additional troubleshooting:

The original SSD and a clone of that SSD both exhibit the same failure.
SSD SMART health is good.
BCD configuration appears correct.
Intel iaStorAC and Microsoft storahci drivers are present and configured for boot startup.
No recent disk/controller errors were found in the System event log.
Startup Repair consistently identifies a recently serviced boot binary as corrupted.

Has anyone else experienced this exact combination of symptoms after KB5132061? Is Microsoft investigating a possible servicing or boot failure affecting Windows 11 24H2 build 26100.9974? After installing the November 2026 Windows 11 update KB5132061, my computer became unbootable and displays INACCESSIBLE_BOOT_DEVICE.

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Answer 1

TaoLi 120.6K Independent Advisor

The pending package states suggest the update and rollback are stuck, but they don’t yet identify what caused the boot failure.

I’d check the servicing log next. Please zip C:\Windows\Logs\CBS\CBS.log from the affected installation, upload it to OneDrive, and share the link. This log records update installation activity; the Windows drive letter may differ in recovery.

Share the log and I’ll take a closer look.

Shawn M 0 Reputation points

2026-11-13T10:30:16.42+00:00
I can’t boot into Windows or I would. I used the media creation tool to make a Win11 USB installation/recovery tool, and I can see everything in the command prompt that way, but I have no way to get it to my ipad to upload.

I ran through the CBS logs with ChatGPT’s assistance. Here’s a summary of what we found:

“I examined the CBS.log from the affected Windows installation.

We did not find an explicit CBS failure identifying a corrupted boot file. Searches for “Failed to install,” “Failed to finalize,” “Failed to process,” “Failed to execute,” “bootmgfw.efi,” and “corrupt” did not reveal a definitive cause.

There were several errors:

0x800f0805 (CBS_E_INVALID_PACKAGE) while opening two older KB3025096 packages (AMD64 and x86).

0x80070490 (ERROR_NOT_FOUND) involving PreviousCurrentBuildNumber and PendingcurrentBuildNumber registry values.

0x80070005 (E_ACCESSDENIED) while moving a CBS temporary folder.

These entries were logged as informational messages, and we found no evidence that they caused the boot failure.

The more significant finding came from an offline DISM rollback attempt:

DISM /Image:D:\ /Cleanup-Image /RevertPendingActions

It failed with:

0x800f082f — CBS_E_EXCLUSIVE_WOULD_MERGE

The log stated:

“Cannot finalize session because execution is frozen.”

It also reported that the session failed to cancel all pending transactions.

The Windows installation showed KB5127648 (build 26100.9711) as Uninstall Pending and KB5132061 (build 26100.9974) as Install Pending.

Startup Repair independently reported: “A recently serviced boot binary is corrupted.”

So far, we have not identified the specific corrupted binary or the underlying cause.”
TaoLi 120.6K Reputation points Independent Advisor

2026-11-13T10:35:10.1266667+00:00

I’d try System Restore from your USB first: Repair your computer >> Troubleshoot >> Advanced options >> System Restore. Choose a restore point from before the update.

If there’s no restore point or it fails, I’d recommend backing up your files to another drive, then doing a clean Windows installation using the USB. You’ll need to reinstall your apps afterward.
Shawn M 0 Reputation points

2026-11-13T10:59:45.05+00:00

Choosing Repair from the USB immediately reboots back to the USB’s install/repair wizard. Doesn’t work. I don’t have any restore points for some reason, too. Booting into the recovery partition and doing revert doesn’t work either. Throws an error.

Unfortunately, a clean install might be the only option, but I’m going to wait a bit to see if any fixes are found. Microsoft is apparently aware of issues with this particular update, and some people on Reddit are having the same issues as me.
TaoLi 120.6K Reputation points Independent Advisor

2026-11-13T11:52:49.9166667+00:00

I understand wanting to wait before reinstalling. For now, keep your SSD clone intact and back up your important files.

but its published fix runs through Windows Update and doesn’t confirm a solution for your boot failure. Waiting alone may therefore not restore the system.

Please share the Reddit thread—I can check whether any reported workaround matches your symptoms.