Cumulative Updates - February 27, 2020 - KB4535996 Optional

February 27, 2020—KB4535996 (OS Builds 18362.693 and 18363.693)


Updates an issue that prevents the speech platform application from opening for several minutes in a high noise environment.
Updates an issue that reduces the image quality in the Windows Mixed Reality (WMR) home environment.
Updates an issue that might prevent ActiveX content from loading.
Improves the battery performance during Modern Standby mode.
Updates an issue that causes Microsoft Narrator to stop working when a user session is longer than 30 minutes.
Addresses an issue that adds an unwanted keyboard layout as the default after an upgrade even if you have already removed it.
Updates an issue that prevents the Windows Search box from rendering properly.
Updates an issue that prevents the printer settings user interface from displaying properly.
Updates an issue that prevents some applications from printing to network printers.

For other Improvements and fixes please refer to Support Article linked above.

February 27, 2020-KB4537572 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1903 and Windows Server 1903 RTM and Windows 10, version 1909 and Windows Server, version 1909

For Quality and reliability improvements please refer to Support Article linked above.

Edit: For further information on Optional Updates refer to post of Sumit - Insider MVP in this thread.

Edit 2.0: Additional update for Windows Defender.

KB4052623 Update for Windows Defender antimalware platform

This package includes monthly updates and fixes to the Windows Defender antimalware platform that is used by Windows Defender Antivirus in Windows 10.

Monthly updates are installed in addition to major Windows 10 releases. Both types of updates should be installed to ensure continued protection against malware and other threats.


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this update sucks.

I can no longer use Cortana to create a calendar entry. she says "there are no devices I can control" like WFT ? I only used cortana to set timers, alarms and calendar entries.

Is there a bug fix for this ? She wont open the app or Google. Nothing. What sort of a device would she be looking for ?

Where do I find the fix for password autofill? It stopped, started again & stopped again. User ID's & Passwords are not auto-filling nor is saving them again working. 
The keyboard on my laptop no longer works since the update

I've tried to install this update a couple of times but it caused some boot issues. Is anyone else having trouble with it?

Log Name:      System
Source:        Microsoft-Windows-Kernel-Power
Date:          3/2/2020 11:09:49 AM
Event ID:      41
Task Category: (63)
Level:         Critical
Keywords:      (70368744177664),(2)
User:          SYSTEM
Computer:      DESKTOP-07VCG2F
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event Xml:
<Event xmlns="">
    <Provider Name="Microsoft-Windows-Kernel-Power" Guid="{331c3b3a-2005-44c2-ac5e-77220c37d6b4}" />
    <TimeCreated SystemTime="2020-03-02T09:09:49.017369100Z" />
    <Correlation />
    <Execution ProcessID="4" ThreadID="8" />
    <Security UserID="S-1-5-18" />
    <Data Name="BugcheckCode">0</Data>
    <Data Name="BugcheckParameter1">0x0</Data>
    <Data Name="BugcheckParameter2">0x0</Data>
    <Data Name="BugcheckParameter3">0x0</Data>
    <Data Name="BugcheckParameter4">0x0</Data>
    <Data Name="SleepInProgress">0</Data>
    <Data Name="PowerButtonTimestamp">0</Data>
    <Data Name="BootAppStatus">0</Data>
    <Data Name="Checkpoint">41</Data>
    <Data Name="ConnectedStandbyInProgress">false</Data>
    <Data Name="SystemSleepTransitionsToOn">1</Data>
    <Data Name="CsEntryScenarioInstanceId">0</Data>
    <Data Name="BugcheckInfoFromEFI">false</Data>
    <Data Name="CheckpointStatus">0</Data>



Any ideas for why this has happened ? Is it possible to be related with the recent updates ? 


This update won't install by default except:

  • Your computer is enrolled in Release preview ring of the Windows Insider program.
  • You installed the update manually using optional updates menu.

If both of those don't apply, start a new question. Otherwise uninstall the update.


Windows Insider MVP 2018-current and Moderator
Dell Inspiron 5590 - i5 10210U/12GB DDR4/ 4GB Nvidia MX230/ 512GB nvme

I just did the new 10 update and lost everything on my desktop.

After I installed this update on 2/27/2020, I noticed that the "System" process in task manager was hammering my SSD with disk writes. I also noticed that 120 GB of additional disk space was used. The disk usage in task manager was 100%, writing at a rate of 1.5 GB/s. I left it for a few hours thinking it would stop. 6 terabytes written later (!!!), and I uninstalled the update. The writes to disk immediately stopped, and the 120 GB that was used was freed. Beware of this update, as it significantly shortened the lifespan of my very expensive 2 TB SSD. 
The latest Microsoft update has caused my audio to stop working.  This is not the first time an update has caused a problem with my pc.  If updates continue to cause problems with my pc, I will want to refuse additional updates. HELP me restore my sound!

Another problem with the update regarding the notebook> message after the update> currently no login to my account (Microsoft account) possible, so I am in a temporary account. I should log out and log in with my account details! All attempts failed. Recovery-WoW 10 Pro, version 1909, newly installed!

From now on, I will suspend all available MS updates for several days and wait and see if there will be any problems.

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Discussion Info

Last updated October 23, 2020 Views 24,711 Applies to: