Microsoft releases Windows 10 builds 16299.201, 10586.1358 - here's what's new

Earlier this month, Microsoft had to release its Patch Tuesday updates early due to the discovery of the Meltdown and Spectre vulnerabilities. They ended up leaving some PCs, particularly those with AMD processors, in an unbootable state. The updates were pulled, and Patch Tuesday was canceled.

Yesterday, the firm released some new updates. There were major changelogs for builds 14393.2034 and 15063.877, which were made available for users of the Anniversary and Creators Updates. For those on the latest version, the Windows 10 Fall Creators Update, there was build 16299.194, which only contained a fix for AMD devices.

Now, it's time to patch the other versions of Windows 10, and oddly enough, there's another update for the Fall Creators Update. KB4073291, or build 16299.201, is only available for PCs with x86 processors, and you can manually download it here. The list of fixes and improvements is not very specific:

This update provides additional protections for 32-Bit (x86) version of Windows 10 1709 after you install January 3, 2018—KB4056892 (OS Build 16299.192).

There are also a few known issues to be aware of:

Symptom Workaround
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.

Due to 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.


The other two updates that were released are for the two oldest versions of Windows 10. If you're on version 1511, you'll get KB4075200, or build 10586.1358, which can be manually downloaded here. It contains the following fixes:

  • Addresses issue where some customers with AMD devices get into an unbootable state.

  • Addresses issue where a part of the system does not log off correctly, which leads to repeated queries for user credentials.

There are two known issues, which are the same as in the update for version 1507.

Symptom Workaround

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.

Due to an issue with some versions of antivirus software, this fix only applies to the machines where the antivirus ISV has updated the ALLOW REGKEY.

Contact your antivirus AV to confirm that their software is compatible and have set the following REGKEY on the machine

Key="HKEY_LOCAL_MACHINE" Subkey="SOFTWARE\Microsoft\Windows\CurrentVersion\QualityCompat"

Value Name="cadca5fe-87d3-4b96-b7fb-a231484277cc"

Type="REG_DWORD”

Data="0x00000000”


Finally, those on the original version of Windows 10, or version 1507, will see KB4075199, or build 10240.17741. You can manually download it here. This update only contains the fix for PCs with AMD processors that may be rendered unbootable by the previous update.

Of course, you can install these updates by going to Settings -> Update & security -> Windows Update, where it will automatically download and install the build that's appropriate for your device. Note that 16299.201 will not appear unless you're running the x86 flavor of Windows 10.

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