Windows 11 Update KB5070311 Install Error Your Device Is Missing Important Security Updates FIX

This message appears when Windows detects that one or more required updates or components are missing, corrupted, or not installed, preventing KB5070311 from applying correctly.

https://www.microsoft.com/en-us/software-download/windows11

1. Required Prerequisite Updates Are Missing

KB5070311 may depend on earlier cumulative updates, Servicing Stack Updates (SSUs), or security components.

If the system is missing a required update (even if it doesn’t appear in Windows Update), Windows cannot continue and shows this error.

Common missing components:

A previous 24H2/25H2 cumulative update

A required Servicing Stack Update (SSU)

Security intelligence updates or platform updates

If these aren't installed, KB5070311 cannot validate the system state.

2. Corrupted WinSxS Component Store

The component store (WinSxS) holds the system files Windows Update needs to verify and install new updates.

If it is corrupted, Windows cannot confirm that required security components are present.

This can be caused by:

previous failed updates

power loss during installation

manual cleaning tools deleting system files

3. Missing or Corrupted Update Manifests

KB5070311 requires certain manifests (.mum/.cat files) to confirm that your system has the proper security baseline.

If these files are:

missing

corrupted

mismatched

Windows assumes required security updates are not present and blocks installation.

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》 CHAPTERS 《

00:00 Intro
00:19 Solution 1
03:24 Solution 2
04:13 Solution 3
06:37 Outro Receive SMS online on sms24.me

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