Windows Update Installation Error 0x800f0922 (KB5124010)

Question

Windows Update Installation Error 0x800f0922 (KB5124010)

ilkka ronka 95

Hi,

This is about the September 2026 pre‑release update (KB5124010) (26200.9550). Installation error – 0x800f0922.

The update downloads normally, but the installation gets stuck at around 40%. I have run the DISM/SFC/scannow commands. The EFI partition should have enough free space (see image).

Please avoid AI‑generated responses; I can take care of that part myself.

System specs (in case relevant):

OS: Windows 11 Pro
CPU: AMD Ryzen 9 5950X
Motherboard: ASUS ROG Strix X570‑F Gaming
Memory: 32 GB DDR4
GPU: MSI / NVIDIA GeForce RTX 5070 Ti
Case: Corsair Carbide 200R
PSU: Fractal Ion Gold 850 W
Cooling: Fractal Design Celsius+ S28 Dynamic (AIO liquid cooler)

indeed

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3 answers

Your answer

Answer 1

Hello.

I am facing the same issue.

It stops at 38%, and Event Viewer records Error 5038 (~\Platform\4.18.26080.4-1\DefenderSessionHelper.exe).

I have tried the following troubleshooting steps, but none of them resolved the issue:

Running DISM and sfc /scannow commands
Checking free space on the EFI partition (221.06 MB free out of 256 MB)
Disabling BitLocker and UEFI Secure Boot
Resetting Windows Update components
Resetting the Windows Defender Antimalware Platform
Temporarily disabling Windows Defender real-time protection
Manually installing KB4052623

OS: Windows 11 Pro

CPU: Intel Core i7-10700

Memory: 64GB DDR4

GPU: GeForce GTX 1660 Super

Security Software: Microsoft Defender

No EDR or similar software installed

Personal PC (not in an AD environment)

P.S.

I think I will wait for the monthly update.

I apologize, but I prefer not to share the CBS logs.

Answer 2

Ramesh 182.4K Volunteer Moderator

As David said, you can opt out of Preview updates and wait for the 2026-10 LCU.

However, if you want to troubleshoot the issue, please upload your CBS logs for analysis.

The logs are available in the following folder. Copy the following folder to the desktop.

c:\windows\logs\cbs

Zip the folder and share the file on OneDrive or GoFile.io. Post the link here.

ilkka ronka 95 Reputation points

2026-09-23T15:09:52.0033333+00:00

I don’t know if it’s safe to upload that?
Ramesh 182.4K Reputation points Volunteer Moderator

2026-09-23T15:16:46.11+00:00

It's safe.
lollipop 0 Reputation points

2026-10-04T13:28:53.9233333+00:00

If I caused any confusion, I apologize.

Fundamentally, there is no issue at all.

The CBS.log records detailed information regarding Windows component updates and repairs, making it essential for resolving issues related to the monthly update(which is why I understand this version is designated as a "Preview" release).

I decided not to publish it, opting instead to simply wait for the monthly update. Although, in truth, having it available for comparison would likely be beneficial.

*I simply wanted to let you know that you are not the only one experiencing this issue.

Answer 3

David-M 127.9K Independent Advisor

Hi. I'm David, and I'm happy to help you.

KB5124010 is a "Preview" update, essentially a beta version of the update scheduled for release next month. Preview updates are optional and may include experimental fixes or features. Because they haven't undergone full testing, they can sometimes be unstable or fail to install properly.

Importantly, you're not required to install preview updates, and skipping them won't expose your system to any security risks.

If KB5124010 continues to fail during installation, you can prevent Windows from attempting to install it by doing the following:

Press "Windows + I" and select "Windows Update";
Toggle off "Get the latest updates as soon as they're available";
Restart (not shutdown) your PC.

This will stop Windows from downloading optional updates like previews, and your system will only receive standard monthly updates going forward.

Feel free to ask any questions you may have.

ilkka ronka 95 Reputation points

2026-09-23T15:07:45.78+00:00

Thank you for your reply. I turned off that setting.
David-M 127.9K Reputation points Independent Advisor

2026-09-23T15:19:29.9033333+00:00

Glad to help.

If Windows Update is no longer attempting to install the update automatically, it is working as intended.

If you do not intend to test the features included in this update, the best approach is to skip it and wait for them to be released in a standard update.

Feel free to ask any questions you may have.
ilkka ronka 95 Reputation points

2026-09-23T16:41:23.3033333+00:00

Yeah, I just booted my computer and opened Windows Update, and there was a notice saying: “The installation went wrong, but you can try again.” There was an X icon, I clicked it, and then it disappeared.
Now the update page is clean.
David-M 127.9K Reputation points Independent Advisor

2026-09-23T16:52:22.56+00:00

Thanks for the update.

This is the expected behavior. Windows will no longer attempt to install this update or future preview updates; only standard updates will be installed.

Best regards.