How to Fix Fix Error 0x8007049D — Windows Update Verification Hash Mismatch on Windows
Getting Windows error 0x8007049D? Update verification hash mismatch? Downloaded update file corrupted? Update integrity check failed? Checksum validation error during update? Fix error code 0x8007049D.
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Main Troubleshooting Guide
How to Fix Windows Update Errors →Complete symptoms, causes, and step-by-step solutions
Symptoms
You might be experiencing this problem if you notice:
- •Windows Update fails with error code 0x8007049D
- •Update downloads completely but fails verification
- •Hash mismatch error during update installation
- •Feature updates fail integrity checks repeatedly
- •Cumulative updates report corrupted download
- •Update retries multiple times then fails with 0x8007049D
Common Causes
- ⚠Downloaded update file corrupted during transfer
- ⚠Windows Update cache contains damaged files
- ⚠Network instability causing incomplete downloads
- ⚠Antivirus scanning corrupting update packages
- ⚠Disk errors in Windows Update storage location
- ⚠Proxy or content filter modifying update data
Solutions
Solution 1: Clear Update Cache and Re-download
- 1Stop update services:
- 2CMD as Admin:
- 3net stop wuauserv
- 4net stop bits
- 5net stop cryptsvc
- 6Delete corrupted cache:
- 7rd /s /q C:\Windows\SoftwareDistribution
- 8rd /s /q C:\Windows\System32\catroot2
- 9Restart services:
- 10net start cryptsvc
- 11net start bits
- 12net start wuauserv
- 13Check for updates again — fresh download should pass verification
Solution 2: Verify Disk and Repair System Files
- 1Check disk for errors:
- 2CMD as Admin:
- 3chkdsk C: /f /r
- 4Schedule scan if prompted, restart PC
- 5After disk check completes:
- 6sfc /scannow
- 7DISM /Online /Cleanup-Image /RestoreHealth
- 8Temporarily disable antivirus real-time scanning
- 9Try update again while AV is paused
- 10Re-enable antivirus after update completes
Solution 3: Manual Update Installation
- 1Note the KB number from Windows Update history
- 2Visit catalog.update.microsoft.com
- 3Search for the KB number
- 4Download the correct version for your system (x64/ARM64)
- 5Run the .msu file directly to install
- 6This bypasses the automatic download verification issue
- 7Restart PC after installation
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