Microsoft Windows 10 20H2 new insider Fast 19577.1000. rs_prerelease. 200228-1439

Good morning, friends! Microsoft has released a new pre-build of Windows 10, numbered 19577, for members of the Windows Insider program who use the Fast Ring channel.

Full build number: 19577.1000. rs_prerelease200228-1439.

We remind you that the “Early access” channel releases builds that may contain rather unpleasant errors. If you need more stability, we recommend switching to the Slow (Late access) or Release Preview channels.


Changes in the diagnostic data section in Parameters» As part of Microsoft’s initiative to increase transparency and control over data, some changes have been made to the Settings app and group policies, which will start appearing in Windows Insider builds this month. Basic diagnostic data are now called “Mandatory diagnostic data”, and full diagnostic data are “Additional diagnostic data”. If you are an enterprise customer and choose to send additional diagnostic data, you will also be provided with detailed group policy settings to configure the data collected in your organization. Microsoft will publish additional details about the new policies closer to release, and in the meantime, we recommend that you read the Microsoft Privacy Report for more information about data collection methods.

Note: Before upgrading to build 19577, make sure that sending full diagnostic data is selected on your device. Note: Before upgrading to build 19577, make sure that sending full diagnostic data is selected for your device. If you select “Advanced” diagnostic data (in group policies), you will not be able to receive future builds of the system. AAD devices or domain-attached devices that have the Advanced level selected will not be able to get the 19577 build. More information about this can be found here.

 New icons: Windows Security

Microsoft continues to release updated icons for pre-installed apps in Windows 10. In build 19577, the Windows Security app icon was updated to match the new design principles outlined by the Microsoft design team here. Unlike many pre-installed applications that can be updated through the Microsoft Store, the new Windows Security icon is updated in the operating system and will be available to users in the final version of the future functional update for Windows 10.

Changes and improvements

  • In the new Cortana app, conversations with your assistant are now available again. For example, you can ask him to tell an anecdote or a bedtime story, as well as offer to play “rock, scissors, paper”.This change is made on the server-side and will be available on all builds with the new Cortana app. Last month, the company returned support for timers and instant responses to Cortana.
  •  Updated the “Advanced boot options” (“Options” – > “Update and security” – > “Recovery” – > “Special boot options” – > “Restart now”) to ensure that some special features work correctly. For example, if ” Screen announcer “was activated before launching” Additional loading parameters”, the function stopped working. Now, when you run the “Advanced boot parameters”, a reboot will be performed in the Windows Recovery Environment.
  •  Although the Vietnamese alphabet does not include the Latin letters F, J, W, and Z, based on feedback, Microsoft added support for these letters in the start menu to correctly group applications such as Windows PowerShell.


  • Fixed an issue where when opening and then closing the clipboard history (WIN + V) without inserting elements, input stopped working in some places of the system.
  •  Fixed an issue that caused extra characters to appear in the Explorer notification if there were no items in the Recent files section.
  •  Fixed an issue where when configuring Windows Hello using Arabic, the configuration progress tracking window did not match your face.
  •  Fixed an issue where safe search parameters (“Settings” – > “Search” – > “Permissions and history”) were not saved when installing updates.
  •  Fixed an issue that caused the microphone to not work on certain devices on builds 19559 — 19569. If you continue to observe problems with the microphone, then report it to the “feedback Center”.
  •  Fixed an issue that affected the stability of explorer.exe for some insiders when navigating in Explorer.
  •  Fixed an issue where using the Restart Manager API to restart explorer.exe has led to the closure of all open Windows store apps.
  •  Fixed an issue that could cause DWN to crash when handwriting on your PC.
  •  Fixed an issue that could cause Outlook to crash if you entered too many characters in the ” To ” field using the Korean IME.
  •  Fixed an issue that occurred when using the “memory Control” function to delete Windows. the old folder could not be completely deleted.
  •  Fixed an issue that could cause the Settings app to hang when going to Windows update.
  •  Fixed an issue where the “Family and other users” page in “Settings” could not load for some insiders.
  •  Fixed an issue that could cause BSOD to appear when Bluetooth was enabled or disabled after exiting sleep mode.
  •  Fixed an issue that occurred on local accounts that caused the “Night light” function to stop working until a reboot after connecting a Microsoft account.
  •  Fixed an issue that caused the device to not restart and start scanning after selecting the “Windows Defender Offline scan” in Windows Security.
  •  Fixed an issue that caused some users to crash “Windows update” with error 0x80070002.
  •  Fixed a problem with the DWM crash that was quite common for some insiders.

Known error

  • BattlEye and Microsoft have identified issues with the compatibility of some Insider Preview builds with certain versions of the anti-cheat program BattlEye due to changes in the operating system. To protect insiders who may have these versions installed, a restriction has been implemented so that Insider Preview builds will not be offered for devices that may be affected by this issue. More information can be found here.
  •  Microsoft is aware of a problem with Screen announcer and NVDA users using the new version of Microsoft Edge based on Chromium, which may cause some difficulties when navigating and reading certain web content. Development teams are working to fix the problem. The problem does not affect users of an outdated version of Microsoft Edge. NVAccess released NVDA 2019.3, which fixes an issue with Edge.
  •  We investigate reports that the system update process may hang for a long time when trying to install a new build.
  •  We are investigating reports that some insiders cannot update to new builds due to the 0x8007042b error.
  •  The “Documents” section in the privacy settings does not display an icon correctly (a simple rectangle).
  •  When updating the system using certain languages, such as Japanese, the “Installing Windows X%” page does not display the text correctly.
  •  The “Download from the cloud” option does not work on this build. Use the local reinstall option when resetting the system settings.
  •  If you use the Win + PrtSc key combination to capture a screenshot, the image is not saved in the Screenshots folder. As a workaround, we suggest using other options for creating screenshots, such as Win + Shift + S.
  •  We investigate reports that the Troubleshooting process (DISM) stops at 84.9%.
  •  Sometimes notifications include incorrect actions (for example, a field for entering a response or various buttons).

We wish you a successful update!

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