Security News > 2024 > July > Windows 11 KB5040527 update fixes Windows Backup failures
![Windows 11 KB5040527 update fixes Windows Backup failures](/static/build/img/news/windows-11-kb5040527-update-fixes-windows-backup-failures-medium.jpg)
Microsoft has released the optional KB5040527 preview cumulative update for Windows 11 23H2 and 22H2, which includes fixes for Windows Backup and upgrade failures.
The July 2024 non-security preview update fixes an issue that sometimes caused Windows backups to fail on devices with an Extensible Firmware Interface system partition.
KB5040527 fixes a Windows Defender Application Control memory leak that could lead to system memory exhaustion while provisioning Windows devices and a separate WDAC bug that triggers app failures when applying WDAC Application ID policies.
"You can install this preview update by clicking on 'Check for Updates" after going into Settings > Windows Update.
Microsoft fixes bug causing Windows Update automation issues.
Windows 11 KB5040442 update released with 31 fixes, changes.
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