KB5000736 Feature update Windows 10 21H1 19043 [Manual download] [2nd update]

On: March 19, 2021

The Enablement Package, KB5000736, turns Windows 10 20H2 into Windows 10 21H1. As with the change from Windows 10 2004 to Windows 10 20H2 (2009), it is only a small update.

The new Windows 10 21H1 is still based on Windows 10 2004 (19041). We won't get a real function update until autumn with the then new Windows 10 21H2.

This means that the regtweak that we showed you here is superfluous, or the update activates everything that was missing so far.

[Update 02/10/2021]: Microsoft has updated the Enablement Package. It now contains the update for Windows 10 2004 and also Windows 10 20H2. Thus, both versions can be updated to the new Windows 10 21H1 with KB5000736. The package also includes the update for removing Adobe Flash Player. As with the feature update from Windows 10 2004 to 20H2, Microsoft Edge is not included.

[Update 03/19/2021]: Microsoft has now made the KB5000736 (Enablement Package) available as * .msu. You can now install the update feature "normally" by double-clicking. It is identical to the * .cab version. So if you have already installed the update, you don't need to do anything.

Officially for everyone, the Windows 10 21H1 will be distributed by Microsoft in April / May 2021.

Manual download of KB5000736 as an msu file

Manual download of KB5000736 as a cab file (version 10.0.19041.844)

We will always update this post if a new revision of the update is made available by Microsoft. The official name for the package is "Feature Update to Windows 10 21H1 via Enablement Package (KB5000736)"

If you are traveling with Windows 10 20H2 and have already removed the Flash Player, you can still use this version:

Since the Windows 10 21H1 is based on Windows 10 2004 (19041), our list of known problems and the problems that have been resolved is maintained.

  • New 3/10/2021 After installing KB5000802, you may get an APC_INDEX_MISMATCH error with a blue screen when trying to print to certain printers in some applications. We are currently investigating the issue and will inform you as soon as we have more information. [2nd update 03/18/2021]: Microsoft has made a new update for Windows 10 available for download. This update is intended to correct incorrect, distorted or empty print results. Further information and the manual downloads can be found in this post.
  • New 3.12.20 The automatic input of furigana (Japanese reading aid) may not work as expected. If you use the Microsoft Japanese Input Method Editor (IME) to input Kanji characters into an application that automatically allows input of furigana characters, you may not get the correct furigana characters and have to enter them manually. Workaround: Restoring a previous version of an IME editor.
  • Devices with affected Conexant or Synaptics audio drivers might get a stop error with a blue screen. (Sound, video and game controllers in the device manager with versions 8.65.47.53, 8.65.56.51 or 8.66.0.0 to 8.66.89.00 for chdrt64.sys or chdrt32.sys.)
Special bugs
  • A Lenovo ThinkPad device can get a blue screen with the message SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (0xc0000005 access denied) after installing KB4568831 (19041.423) or higher. The associated process is ldiagio. sys. “Enabling the Windows Biometric Security Enhanced Option in the UEFI of Lenovo ThinkPad devices manufactured in 2019 or 2020 is the condition that causes this behavior. When the Lenovo Vantage software is running, some versions may be trying to access the configuration of the PCI device in an unsupported manner. This action causes a stop error to occur. ” Workaround: In Bios Security> Virtualization deactivate the extended Windows biometric security. More about it here
  • Windows Sandbox or WDAG starts with an error message.
  • A bug prevents cookies from being saved in the browser or the passwords under Windows 10.
Unofficial - Reports from multiple users
  • Create local account during installation, not possible. This is not a problem, it is wanted by Microsoft. Anyone who has already installed Windows 10 with a Microsoft account will not see the option "Offline Account" during the installation. The only thing that helps is to cut off the Internet to the computer, or to enter the wrong password a few times. If you have never installed with a Microsoft account before, you will still see the selection.
  • It can happen that Defrag (HDD, Trim command, Storage Spaces or VHDX) does not run automatically via maintenance.
  • Storage Spaces: A storage space with mirror (simple redundancy) and ReFS file system does not physically free any more memory when data is deleted. The version of ReFS or the Storage Spaces version is irrelevant.
  • Storage Spaces: Defrag fills the drive during optimization and no longer releases the space to the pool if the drive is formatted with ReFS.
  • Computer responds very slowly or not at all. The computer cannot be shut down because the services are not stopped. - This could be due to the AMD chipset or graphics driver.
  • Connected standby cannot be deactivated.
  • Windows always starts in tablet mode. Workaround: Settings -> System -> Tablet set "Never use tablet mode".
  • Remote desktop connection not possible if the group policy "Use standard hardware graphics adapter for all remote desktop services" is activated. A possible workaround that has not yet been confirmed. See also social.technet.

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