How to Fix KB5021255 Update Not Installing on Windows 11

Update KB5021255 not working, not installed or downloaded on Windows 11?

Windows released the update on December 13, 2022 (OS Build 22621.963).

The update fixes an issue with Task Manager displaying elements with strange colors.

The problem occurs if you set “Choose your mode” to “Custom” in the personalization settings.

Many improvements have been made such as the Data Protection Application Programming Interface.

The problem is that decrypting the certificate’s private key may fail, which causes VPN and other certificate-based authentications to fail as well.

In this guide, you’ll learn how to troubleshoot installation/download issues for update KB5021255 on Windows 11.

• Fix 1: Run the Update Troubleshooter
• Fix 2: Restart Windows Update and Smart Background Service
• Fix 3: Use Windows 11 Setup Assistant
• Fix 4: Use Microsoft Update Catalog
• Fix 5: Reset Windows Update components
• Fix 6: Using the Media Creation Tool

Fix 1: Run the Update Troubleshooter

1. Open the Windows start menu > Settings.
2. System > Troubleshoot > More Troubleshooter.
3. Windows Update > Run > Restart your PC.

Fix 2: Restart Windows Update and Smart Background Service

1. Search Windows > Services.
2. Windows Update > Startup Type > Automatic > Apply > OK.
3. Select “Restart Service” for “Windows Update”.
4. Smart Background Service > Startup Type > Automatic > Apply > OK.
5. Select “Service Restart” for “Intelligent Streaming Service in the Background”.
6. Restart your PC.

Fix 3: Use Windows 11 Setup Assistant

1. Go to https://www.microsoft.com/software-download/windows11.
2. Click “Download now”.
3. Run the .exe file > Accept and install.

Fix 4: Use Microsoft Update Catalog

1. Go to https://www.catalog.update.microsoft.com/Home.aspx.
2. Search for “KB5021255”.
3. Download Windows 11 update KB5021255.
4. Restart your PC.

Fix 5: Reset Windows Update components

Copy and paste them into the Notepad application:

SC config Trustedinstaller start=auto net stop bits net stop wuauserv net stop msiser net stop cryptsvc net stop appidsvc Ren %Systemroot%\SoftwareDistribution SoftwareDistribution.old Ren %Systemroot%\System32\catroot2 catroot2.old regsvr32.exe /s atl.dll regsvr32 .exe /s urlmon.dll regsvr32.exe /s mshtml.dll netsh winock reset netsh winock reset proxy rundll32.exe pnpclean.dll,RunDLL_PnpClean /DRIVERS /MAXCLEAN dism /Online /Cleanup-image /ScanHealth dism /Online /Cleanup-image /CheckHealth dism /Online /Cleanup-image /RestoreHealth dism /Online /Cleanup-image /StartComponentCleanup Sfc /ScanNow net start bits net start wuauserv net start msiserver net start cryptsvc net start appidsvc

Save the file as “Wufix.bat” > set location as desktop > All files > Save.

Run the file as administrator to restart all Windows update services and restart your PC.

Fix 6: Using the Media Creation Tool

1. Go to https://www.microsoft.com/en-us/software-download/windows11.
2. Click “Download now”.
3. Follow the instructions on the screen.
4. Open the downloaded file.
5. Run the setup file.
6. Follow the on-screen instructions and complete the installation.

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Categories: How to
Source: thpttranhungdao.edu.vn/en/