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The Windows Update error 0x800f0905 when attempting to install KB5050021 in Windows 11 typically indicates issues related to missing dependencies, corrupted system files, or misconfigured settings. This error often occurs during the installation of feature updates or cumulative updates due to problems with Windows Update components or system configurations. Below are the primary causes and explanations for this error:

Causes of Windows Update Error 0x800f0905

1. Missing .NET Framework or Dependencies

The update may require specific components of the .NET Framework or other system libraries, which are missing or not properly installed.

2. Corrupted Windows Update Components

Files stored in the SoftwareDistribution or Catroot2 folders, which are essential for Windows Update, may be corrupted or incomplete, leading to installation failure.

3. System File Corruption

Essential system files required for the update may be missing or damaged, preventing the update from installing properly.

4. Disabled or Misconfigured Services

Key services such as Windows Update (wuauserv), Background Intelligent Transfer Service (BITS), or Cryptographic Services (cryptSvc) may be stopped or improperly configured.

5. Insufficient Disk Space

The system drive (usually C:) may not have enough free space to download and install the update, causing the process to fail.

This troubleshooting guide will work Windows 11 operating systems (Home, Professional, Enterprise, Education) and desktops, laptops, tables and computers manufactured by the following brands: Asus, Dell, HP, MSI, Alienware, MSI, Toshiba, Acer, Lenovo, razer, huawei, dynabook, LG , vaio, Microsoft Surface among others.

Copy and paste this:

net stop bits
net stop wuauserv
net stop appidsvc
net stop cryptsvc
Del "%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\*.*"
rmdir %systemroot%\SoftwareDistribution /S /Q
rmdir %systemroot%\system32\catroot2 /S /Q
sc.exe sdset bits D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPWPDTLOCRRC;;;PU)
sc.exe sdset wuauserv D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPWPDTLOCRRC;;;PU)
cd /d %windir%\system32

regsvr32.exe /s atl.dll
regsvr32.exe /s urlmon.dll
regsvr32.exe /s mshtml.dll
regsvr32.exe /s shdocvw.dll
regsvr32.exe /s browseui.dll
regsvr32.exe /s jscript.dll
regsvr32.exe /s vbscript.dll
regsvr32.exe /s scrrun.dll
regsvr32.exe /s msxml.dll
regsvr32.exe /s msxml3.dll
regsvr32.exe /s msxml6.dll
regsvr32.exe /s actxprxy.dll
regsvr32.exe /s softpub.dll
regsvr32.exe /s wintrust.dll
regsvr32.exe /s dssenh.dll
regsvr32.exe /s rsaenh.dll
regsvr32.exe /s gpkcsp.dll
regsvr32.exe /s sccbase.dll
regsvr32.exe /s slbcsp.dll
regsvr32.exe /s cryptdlg.dll
regsvr32.exe /s oleaut32.dll
regsvr32.exe /s ole32.dll
regsvr32.exe /s shell32.dll
regsvr32.exe /s initpki.dll
regsvr32.exe /s wuapi.dll
regsvr32.exe /s wuaueng.dll
regsvr32.exe /s wuaueng1.dll
regsvr32.exe /s wucltui.dll
regsvr32.exe /s wups.dll
regsvr32.exe /s wups2.dll
regsvr32.exe /s wuweb.dll
regsvr32.exe /s qmgr.dll
regsvr32.exe /s qmgrprxy.dll
regsvr32.exe /s wucltux.dll
regsvr32.exe /s muweb.dll
regsvr32.exe /s wuwebv.dll
netsh winsock reset
netsh winsock reset proxy
net start bits
net start wuauserv
net start appidsvc
net start cryptsvc

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》 CHAPTERS 《

00:00 Intro
00:30 Solution 1
02:17 Solution 2
03:52 Solution 3
06:22 Solution 4
09:53 Outro