Microsoft today released a new cumulative update Build 16299.201 (10.0.16299.201) to everyone on Fall Creators update. Cumulative update KB407321 brings this build and is available to install.

As expected this cumulative update doesn’t bring anything new in terms of changes and features. This update provides additional protections for 32-Bit (x86) version of Windows 10 1709 after you install KB4056892 (OS Build 16299.192). Read the full changelog below.

You can check the update availability by going to Settings–>Update & Security–>Windows update–>Check for updates.

Windows 10 Build 16299.201(KB407321) Changelog:

Improvements and fixes


This update provides additional protections for 32-Bit (x86) version of Windows 10 1709 after you install KB4056892 (OS Build 16299.192).

Known issues in this update


SymptomWorkaround
Windows Update History reports that KB4054517 failed to install because of Error 0x80070643.Even though the update was successfully installed, Windows Update incorrectly reports that the update failed to install. To verify the installation, select Check for Updates to confirm that there are no additional updates available.

You can also type About your PC in the Search box on your taskbar to confirm that your device is using the expected OS build.

Microsoft is working on a resolution and will provide an update in an upcoming release.

When calling CoInitializeSecurity, the call will fail if passing RPC_C_IMP_LEVEL_NONE under certain conditions.

When calling CoInitializeSecurity, the call may fail when passing RPC_C_AUTHN_LEVEL_NONE as the authentication level. The error returned on failure is STATUS_BAD_IMPERSONATION_LEVEL.

Change the authentication level parameter to RPC_C_AUTHN_LEVEL_CALL.

Microsoft is working on a resolution and will provide an update in an upcoming release.

Because of compatibility issues with some versions of antivirus software, this update causes stop errors or abrupt reboots.Contact your antivirus (AV) vendor and follow their guidance.