Windows 10 update KB4088776 (build 16299.309) releases

Windows 10 Fall Creators Update gets update with security patches and fixes for Windows Mixed Reality. Here are the new improvements.

As part of the March Patch Tuesday, Microsoft is now releasing a new update for the Windows 10 version 1709 (Fall Creators update). The update is labeled as KB4088776 and brings a number of fixes.

KB4088776 bumps the version number of Windows 10 to build 16299.309, and according to Microsoft, it addresses issues with Windows Mixed Reality, and patches a few vulnerabilities with Microsoft Edge, Windows Shell, Windows Desktop Bridge, and more.

What’s new with Windows 10 build 16299.309

Microsoft has announced KB4088776 in the Windows support site, and it’s referred as “March 13, 2018—KB4088776 (OS Build 16299.309)”. If you’re already running the Windows 10 Fall Creators Update on your PC, this update will only address these issues:

  • Addresses issue where, after installing KB4090913, the Mixed Reality Portal may fail to initialize. This results in an “SXXXXXXX-X” error or a “We couldn’t download the Windows Mixed Reality Software” message may appear after the software is successfully downloaded.
  • Lifts the Anti-Virus (AV) compatibility check to expand the number of Windows 10 devices that are offered cumulative Windows security updates. This includes cumulative Spectre and Meltdown protections for 32-Bit (x86) and 64-Bit (x64) versions of Windows, except the KB4078130 update that was offered to disable mitigation against Spectre Variant 2.
  • Addresses issue that only affects some versions of antivirus software and only applies to computers on which the antivirus ISV updated the ALLOW REGKEY.
  • Fixes problem with printing XML documents with Internet Explorer and Microsoft Edge.
  • Addresses issue where Internet Explorer stops working when using F12-based developer tools.
  • Updates legacy Document Mode cell visibility in Internet Explorer.
  • Fixes problem where Internet Explorer is unresponsive in certain scenarios when a Browser Helper Object is installed.
  • Fixes problem with pinch and zoom gestures on some hardware in Internet Explorer.
  • Addresses issue to prevent media and other applications from becoming unresponsive or failing when upgrading graphics drivers.
  • Fixes problem where customers receive “Check your account, you don’t own this content” errors when attempting to play or install owned content. 
  • Addresses issue where, after installing KB4056892, KB4073291, KB4058258, KB4077675, or KB4074588 on a server, you may not be able to access SMB shared files in directory junction points or volume mount points hosted on that server.
  • Fixes problem where an AD FS server issue causes the WID AD FS database to become unusable after a restart. This might prevent the AD FS service from starting.
  • Security updates to Internet Explorer, Microsoft Edge, Microsoft Scripting Engine, Windows Desktop Bridge, Windows Kernel, Windows Shell, Windows MSXML, Device Guard, Windows Hyper-V, Windows Installer, and the Microsoft Scripting Engine.

What’s new for older versions of Windows 10

Alongside the latest patch for the Fall Creators Update, Microsoft is also releasing update KB4088782 for the Windows 10 version 1703 (Creators Update) fixing several bugs, and the update also bumps the build number to 15063.966.

The Windows 10 version 1607 (Anniversary Update) gets KB4088787 to addresses a number of problems and bumps the build number to 14393.2125. Windows 10 version 1511 (November Update) receives update KB4088779 bumping build number to 10586.1478. Also, the initial version of Windows 10 gets update KB4088786, which increases the build number to 10240.17797, and addresses various security vulnerabilities and other issues.

How to download March 13 update for Windows 10

Windows 10 build 16299.309 (KB4088776) for PCs is available immediately. The new update will download and install automatically, but you can always force the update from Settings > Update & security > Windows Update and clicking the Check for updates button.

It’s worth noting that this patch contains a few known issues that you should be aware of before installing. (For more details check the Windows support site using the link mentioned above.) You can find more details about the most recent updates in the Windows 10 update history guide.

You can download this update directly from Microsoft using these links:

About the author

Mauro Huculak is a Windows How-To Expert who started Pureinfotech in 2010 as an independent online publication. He has also been a Windows Central contributor for nearly a decade. Mauro has over 14 years of experience writing comprehensive guides and creating professional videos about Windows and software, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 20 years of combined experience in technology. Throughout his career, he achieved different professional certifications from Microsoft (MSCA), Cisco (CCNP), VMware (VCP), and CompTIA (A+ and Network+), and he has been recognized as a Microsoft MVP for many years. You can follow him on X (Twitter), YouTube, LinkedIn and Email him at [email protected].