KB5077241 Update Not Installing Error Code 0x80070306/0x800f0991/0x800f081f Windows 11 FIX
Error 0x80070306/0x800f0991/0x800f081f While Installing KB5077241 translates to:“The source files could not be found.”
During installation, Windows Update attempts to locate required system components. If those files are missing, corrupted, or unavailable, the update fails.
https://www.microsoft.com/en-us/software-download/windows11
1. Missing or Damaged Servicing Stack Update (SSU) (Primary Cause)
KB5077241 depends on a working Servicing Stack Update.
If the SSU is:
• Missing
• Outdated
• Partially installed
Windows cannot process the cumulative update.
⸻
2. Corrupted WinSxS Component Store
The WinSxS folder contains the system components and manifests required for updates.
If it contains:
- Missing .mum or .cat files
- Corrupted package metadata
- Inconsistent component references
Windows cannot locate the necessary source files.
⸻
3. Missing Prerequisite Updates
If previous cumulative updates were:
- Skipped
- Failed
- Not fully installed
KB5077241 may not find required dependencies.
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》 CHAPTERS 《
00:00 Intro
00:25 Solution #1
01:29 Solution #2
02:30 Solution #3
03:17 Solution #4
04:15 Solution #5 Receive SMS online on sms24.me
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