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The Windows 10 update error 0x800703e6 with the message “Your device is missing important security and quality fixes” usually means that Windows Update is unable to install or apply updates due to corrupted system files, broken update components, or missing dependencies. This error may also occur after a failed update attempt, especially if your device hasn’t been updated in a long time or if an essential Servicing Stack Update (SSU) is missing.

Causes of Windows 10 Update Error 0x800703e6
1. Corrupted Windows Update Components
When the SoftwareDistribution or Catroot2 folders (which store update data) are damaged, Windows can’t apply updates correctly.

Fix: Reset Windows Update cache
Run these commands in Command Prompt (Admin):


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
regsvr32.exe /s atl.dll
regsvr32.exe /s urlmon.dll
regsvr32.exe /s mshtml.dll
netsh winsock reset
netsh winsock reset proxy
net start bits
net start wuauserv
net start appidsvc
net start cryptsvc


2. Missing or Outdated Servicing Stack Update (SSU)
SSUs are required before installing new cumulative updates. If one is missing or outdated, you may see this error.

Fix:

Go to the Microsoft Update Catalog

Search for and install the latest Servicing Stack Update for your Windows 10 version.

3. Corrupted System Files
If essential system files are missing or damaged, updates can’t be applied and Windows may falsely report that security updates are missing.

Fix: Use repair tools
Run the following in Command Prompt (Admin):

sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

》 CAPÍTULOS 《

00:00 Introducción
00:33 Solución 1
02:11 Solución 2
03:05 Solución 3
05:14 Conclusión