Windows 10: Why was KB4601554 cumulative update so destructive?

Yea-I'm-Native · May 27, 2021

My system recently received the May 10, 2021 Windows 21H1 update. Immediately after finishing the update windows update automatically download and applied KB4601554 , May 11, 2021-KB4601554 Cumulative Update for .NET Framework 3.5 and 4.8.After system restart every user profile has all settings reset to OOBE default settings, with the exception of Username, Password, and PIN number.WIFI network list is reset, network places were removed, all Bluetooth device pairings were deleted, file folder options were reset, desktop backgrounds were removed not reset, but deleted. Screensaver setti

:)

Brink · May 27, 2021

KB4601554 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10

February 24, 2021 - KB4601554 Cumulative Update Preview for .NET Framework 3.5 and 4.8 for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2

The February 24, 2021 update for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, and Windows Server, version 20H2 includes cumulative reliability improvements in .NET Framework 3.5 and 4.8. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequsites and Restart requirement sections.

Quality and reliability improvements

[table][tr][td]CLR1[/td] [td]- Addresses an issue where the entire process would be torn down when a NullReferenceException propagated out of an exception filter. - Addresses an issue with slowdowns that could occur when making large numbers of devirtualized calls into MarshalByRefObject-derived code.[/td] [/tr] [tr][td]WPF2[/td] [td]- Addresses an issue with lag responding to typing in TextBox, when spell-checking is enabled that was introduced in an update earlier this year. - Addresses an issue with a leak of touch-related resources, including OS handles, when closing a window. The leak only occurs when a touch device is active, and only for windows whose HwndSource is created directly by the app. - Addresses a crash when docking a window within Visual Studio, or, more generally, disposing an HwndSource whose RootVisual is null.[/td] [/tr] [tr][td]Winforms[/td] [td]- Addresses an issue in ComboBox drop down item bounding rectangle as exposed to the accessibility tools, where we did not take into account that some items might be scrolled out of view, we had always started counting items from the first visible one, and thus item rectangle location was incorrect. - Implemented ScrollItemPattern (IScrollItemProvider (uiautomationcore.h) - Win32 apps | Microsoft Docs) for ComboBox drop down items.[/td] [/tr] [/table]
1 Common Language Runtime (CLR)
2 Windows Presentation Foundation (WPF)

How to get this update

Install this update

[table][tr][td]Release Channel[/td] [td]Available[/td] [td]Next Step[/td] [/tr] [tr][td]Windows Update and Microsoft Update[/td] [td]Yes[/td] [td]To download and install this update, go to Settings > Update & Security > Windows Update, and then select Check for updates.[/td] [/tr] [tr][td]Microsoft Update Catalog[/td] [td]Yes[/td] [td]To get the standalone package for this update, go to the Microsoft Update Catalog website.[/td] [/tr] [tr][td]Windows Server Update Services (WSUS)[/td] [td]No[/td] [td]You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.[/td] [/tr] [/table]

File information

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

Prerequisites

To apply this update, you must have .NET Framework 3.5 or 4.8 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

How to obtain help and support for this update

Help for installing updates: Windows Update FAQ

Protect yourself online and at home: Windows Security support

Local support according to your country: International Support

Known issues in this update

Microsoft is not currently aware of any issues in this update.
Click to expand...

Source: https://support.microsoft.com/en-us/...3-226f7798225a

Direct download links for KB4601554 MSU file from Microsoft Update Catalog:

Download KB4601554 MSU for Windows 10 v2004 and 20H2 32-bit (x86) - 41.6 MB

Download KB4601554 MSU for Windows 10 v2004 and 20H2 64-bit (x64) - 65.2 MB

Download KB4601554 MSU for Windows 10 v2004 and 20H2 ARM64 - 41.6 MB

Brink · May 27, 2021

KB4601554 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 10

May 11, 2021 - KB4601554 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, Windows Server, version 20H2, and Windows Server 21H1

Release Date:
May 11, 2021

Version:
.NET Framework 3.5 and 4.8

The May 11, 2021 update for Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, Windows Server, version 20H2, and Windows Server 21H1 includes cumulative reliability improvements in .NET Framework 3.5 and 4.8. We recommend that you apply this update as part of your regular maintenance routines. Before you install this update, see the Prerequsites and Restart requirement sections.

Quality and reliability improvements

[table][tr][td]CLR1[/td] [td]- Addresses an issue where the entire process would be torn down when a NullReferenceException propagated out of an exception filter. - Addresses an issue with slowdowns that could occur when making large numbers of devirtualized calls into MarshalByRefObject-derived code.[/td] [/tr] [tr][td]WPF2[/td] [td]- Addresses an issue with lag responding to typing in TextBox, when spell-checking is enabled that was introduced in an update earlier this year. - Addresses an issue with a leak of touch-related resources, including OS handles, when closing a window. The leak only occurs when a touch device is active, and only for windows whose HwndSource is created directly by the app. - Addresses a crash when docking a window within Visual Studio, or, more generally, disposing an HwndSource whose RootVisual is null.[/td] [/tr] [tr][td]Winforms[/td] [td]- Addresses an issue in ComboBox drop down item bounding rectangle as exposed to the accessibility tools, where we did not take into account that some items might be scrolled out of view, we had always started counting items from the first visible one, and thus item rectangle location was incorrect. - Implemented ScrollItemPattern (IScrollItemProvider (uiautomationcore.h) - Win32 apps | Microsoft Docs) for ComboBox drop down items.[/td] [/tr] [/table]
1 Common Language Runtime (CLR)
2 Windows Presentation Foundation (WPF)

How to get this update

Install this update

[table][tr][td]Release Channel[/td] [td]Available[/td] [td]Next Step[/td] [/tr] [tr][td]Windows Update and Microsoft Update[/td] [td]Yes[/td] [td]To download and install this update, go to Settings > Update & Security > Windows Update, and then select Check for updates.[/td] [/tr] [tr][td]Microsoft Update Catalog[/td] [td]Yes[/td] [td]To get the standalone package for this update, go to the Microsoft Update Catalog website.[/td] [/tr] [tr][td]Windows Server Update Services (WSUS)[/td] [td]Yes[/td] [td]This update will automatically sync with WSUS if you configure Products and Classifications as follows: Product: Windows 10, version 2004, Windows Server, version 2004, Windows 10, version 20H2, Windows Server, version 20H2, and Windows Server 21H1 Classification: Updates[/td] [/tr] [/table]

File information

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

Prerequisites

To apply this update, you must have .NET Framework 3.5 or 4.8 installed.

Restart requirement

You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.

How to obtain help and support for this update

Help for installing updates: Windows Update FAQ

Protect yourself online and at home: Windows Security support

Local support according to your country: International Support

Known issues in this update

Microsoft is not currently aware of any issues in this update.
Click to expand...

Source: https://support.microsoft.com/en-us/...3-226f7798225a

Direct download links for KB4601554 MSU file from Microsoft Update Catalog:

Download KB4601554 MSU for Windows 10 v2004, 20H2, and 20H1 32-bit (x86) - 41.6 MB

Download KB4601554 MSU for Windows 10 v2004, 20H2, and 20H1 64-bit (x64) - 65.2 MB

Download KB4601554 MSU for Windows 10 v2004, 20H2, and 20H1 ARM64 - 41.6 MB

Scramjet · May 27, 2021

KB4601554 update and KB4601382 update

Anyone else get these updates today? "2021-02 Cumulative Update Preview for .NET Framework 3.5 and 4.8 for Windows 10, version 20H2 for x64 (KB4601554)". Also "2021-02 Cumulative Update Preview for Windows Version 20H2 for x64-based Systems (KB4601382).
Haven't seen them posted in the News here on this forum.

cheers

Windows 10: Why was KB4601554 cumulative update so destructive?

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