July 20, 2021—KB5004308 (OS Build 17763.2090) Preview

^6/15/21 IMPORTANT This release includes the Flash Removal Package. Taking this update will remove Adobe Flash from the machine. For more information, see the Update on Adobe Flash Player End of Support.

^5/11/21 REMINDER Windows 10, version 1809 reached end of service on May 11, 2021 for devices running the Enterprise, Education, and IoT Enterprise editions. After May 11, 2021, these devices will no longer receive monthly security and quality updates that contain protection from the latest security threats. To continue receiving security and quality updates, Microsoft recommends updating to the latest version of Windows 10.

We will continue to service the following editions: Enterprise G, HoloLens, and the LTSC editions for Client, Server, and IoT.

^5/11/21 REMINDER Microsoft removed the Microsoft Edge Legacy desktop application that is out of support in April 2021. In the May 11, 2021 release, we installed the new Microsoft Edge. For more information, see New Microsoft Edge to replace Microsoft Edge Legacy with April’s Windows 10 Update Tuesday release.

11/17/20 For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. To view other notes and messages, see the Windows 10, version 1809 update history page.

Highlights

Updates an issue that fails to detect that you are connected to the internet after you connect to a virtual private network (VPN).
Updates an issue that prevents power plans and Game Mode from working as expected. This results in lower frame rates and reduced performance while gaming.

Improvements and fixes

This non-security update includes quality improvements. Key changes include:

Addresses an issue that causes 16-bit apps to stop working when you open them if those apps are running on NT Virtual DOS Machine (NTVDM).
Addresses a timing issue in the Group Policy Registry Telemetry that causes Group Policy extension processing to fail.
Addresses an issue in that might cause the Local Security Authority Subsystem Service (LSASS) process on Active Directory domain controllers to stop working under high load scenarios.
Addresses an issue that causes the enrollment of the Elliptic Curve Digital Signature Algorithm (ECDSA) certificate to fail with the error, “0x80090027 NTE_INVALID_PARAMETER”. This issue occurs when the Trusted Platform Module (TPM) provider (the Microsoft Software Key Storage Provider) stores the key.
Addresses an issue with auditing events 4624 and 5142 that display the wrong event template when Dutch is the display language.
Addresses an issue that causes System Integrity to leak memory.
Addresses an issue in which the Network Connectivity Status Indicator (NCSI) fails to detect internet connectivity after you connect to a virtual private network (VPN).
Addresses a reliability issue that might lead to stop error 0x51 (REGISTRY_ERROR). This issue might occur when applications use volatile registry keys excessively.
Addresses an issue with the App Readiness service that prevents users from signing in successfully.
Addresses an issue that prevents power plans and Game Mode from working as expected. This results in lower frame rates and reduced performance while gaming.
Addresses a rare issue that might degrade performance in applications that call Gdiplus.dll!GdipMeasureString in a tight loop with a new font on each call. This issue occurs after installing Windows updates released on and after February 2021.
Addresses an issue that always displays devices that RemoteFX USB redirects as "Remote Desktop Generic USB Device" instead of the actual device name.
Addresses a Local Security Authority Subsystem Service (LSASS) domain controller memory leak that is reported in Privileged Access Management (PAM) deployments.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.

Windows Update Improvements

Microsoft has released an update directly to the Windows Update client to improve reliability. Any device running Windows 10 configured to receive updates automatically from Windows Update, including Enterprise and Pro editions, will be offered the latest Windows 10 feature update based on device compatibility and Windows Update for Business deferral policy. This doesn't apply to long-term servicing editions.

Known issues in this update

Symptom	Workaround
After installing KB4493509, devices with some Asian language packs installed may receive the error, "0x800f0982 - PSFX_E_MATCHING_COMPONENT_NOT_FOUND."	Uninstall and reinstall any recently added language packs. For instructions, see Manage the input and display language settings in Windows 10. Select Check for Updates and install the April 2019 Cumulative Update. For instructions, see Update Windows 10. Note If reinstalling the language pack does not mitigate the issue, reset your PC as follows: Go to the Settings app > Recovery. Select Get Started under the Reset this PC recovery option. Select Keep my Files. Microsoft is working on a resolution and will provide an update in an upcoming release.
After installing KB5001342 or later, the Cluster Service might fail to start because a Cluster Network Driver is not found.	This issue occurs because of an update to the PnP class drivers used by this service. After about 20 minutes, you should be able to restart your device and not encounter this issue. For more information about the specific errors, cause, and workaround for this issue, please see KB5003571.
After installing updates released April 22, 2021 or later, an issue occurs that affects versions of Windows Server that are in use as a Key Management Services (KMS) host. Client devices running Windows 10 Enterprise LTSC 2019 and Windows 10 Enterprise LTSC 2016 might fail to activate. This issue only occurs when using a new Customer Support Volume License Key (CSVLK). Note This does not affect activation of any other version or edition of Windows. Client devices that are attempting to activate and are affected by this issue might receive the error, "Error: 0xC004F074. The Software Licensing Service reported that the computer could not be activated. No Key Management Service (KMS) could be contacted. Please see the Application Event Log for additional information." Event Log entries related to activation are another way to tell that you might be affected by this issue. Open Event Viewer on the client device that failed activation and go to Windows Logs > Application. If you see only event ID 12288 without a corresponding event ID 12289, this means one of the following: The KMS client could not reach the KMS host. The KMS host did not respond. The client did not receive the response. For more information on these event IDs, see Useful KMS client events - Event ID 12288 and Event ID 12289.	This issue is resolved in KB5009616.

Symptom

Workaround

After installing KB4493509, devices with some Asian language packs installed may receive the error, "0x800f0982 - PSFX_E_MATCHING_COMPONENT_NOT_FOUND."

Uninstall and reinstall any recently added language packs. For instructions, see Manage the input and display language settings in Windows 10.
Select Check for Updates and install the April 2019 Cumulative Update. For instructions, see Update Windows 10.

Note If reinstalling the language pack does not mitigate the issue, reset your PC as follows:

Go to the Settings app > Recovery.
Select Get Started under the Reset this PC recovery option.
Select Keep my Files.

Microsoft is working on a resolution and will provide an update in an upcoming release.

After installing KB5001342 or later, the Cluster Service might fail to start because a Cluster Network Driver is not found.

This issue occurs because of an update to the PnP class drivers used by this service. After about 20 minutes, you should be able to restart your device and not encounter this issue. For more information about the specific errors, cause, and workaround for this issue, please see KB5003571.

After installing updates released April 22, 2021 or later, an issue occurs that affects versions of Windows Server that are in use as a Key Management Services (KMS) host. Client devices running Windows 10 Enterprise LTSC 2019 and Windows 10 Enterprise LTSC 2016 might fail to activate. This issue only occurs when using a new Customer Support Volume License Key (CSVLK).

Note This does not affect activation of any other version or edition of Windows.

Client devices that are attempting to activate and are affected by this issue might receive the error, "Error: 0xC004F074. The Software Licensing Service reported that the computer could not be activated. No Key Management Service (KMS) could be contacted. Please see the Application Event Log for additional information."

Event Log entries related to activation are another way to tell that you might be affected by this issue. Open Event Viewer on the client device that failed activation and go to Windows Logs > Application. If you see only event ID 12288 without a corresponding event ID 12289, this means one of the following:

The KMS client could not reach the KMS host.
The KMS host did not respond.
The client did not receive the response.

For more information on these event IDs, see Useful KMS client events - Event ID 12288 and Event ID 12289.

This issue is resolved in KB5009616.

How to get this update

Before installing this update

Prerequisite:

You must install the May 11, 2021 servicing stack update (SSU) (KB5003243) or the latest SSU (KB5004424) before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you are using Windows Update, the latest SSU will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

Install this update

Release Channel	Available	Next Step
Windows Update or Microsoft Update	Yes	Go to Settings > Update & Security > Windows Update. In the Optional updates available area, you’ll find the link to download and install the update.
Windows Update for Business	No	None. These changes will be included in the next security update to this channel.
Microsoft Update Catalog	Yes	To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)	No	You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 5004308.

July 20, 2021—KB5004308 (OS Build 17763.2090) Preview

Highlights

Improvements and fixes

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Highlights

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