OS Build 10240.19387
IMPORTANT As of 9/12/2023, this KB is no longer available from Windows Update, the Microsoft Update Catalog, or other release channels. We recommend that you update your devices to the latest security quality update.
IMPORTANT Microsoft released KB5012170 on August 9, 2022. It provides support for Secure Boot Forbidden Signature Database (DBX). This is a standalone, security update. Windows 8.1 and newer clients and Windows Server 2012 and newer servers must install this update regardless of whether BitLocker is enabled or supported on your device. After you install the update, you might receive error “0x800f0922”; see Update might fail to install and you might receive a 0x800f0922 error. After you install the update, your device might start up in BitLocker recovery mode. See Some devices might start up into BitLocker Recovery and Finding your BitLocker recovery key in Windows.
Addresses an issue that prevents certain troubleshooting tools rom opening.
Addresses security issues for your Windows operating system.
This security update includes quality improvements. Key changes include:
Addresses an issue that prevents certain troubleshooting tools from opening.
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
Known issues in this update
Starting at 12:00 A.M. Saturday, September 10, 2022, the official time in Chile will advance 60 minutes in accordance with the August 9, 2022 official announcement by the Chilean government about a daylight saving time (DST) time zone change. This moves the DST change which was previously September 4 to September 10.
Symptoms if the workaround is not used on devices between September 4, 2022 and September 11, 2022:
To mitigate this issue, please see Possible issues caused by new Daylight Savings Time in Chile.
We are working on a resolution and will provide an update in an upcoming release.
Note We plan to release an update to support this change; however, there might be insufficient time to properly build, test, and release such an update before the change goes into effect. Please use the workaround above.
How to get this update
This update is no longer available.