Microsoft releases updated HLK and VHLK for Windows 11 24H2 & Server 2025

Microsoft isn’t slowing down this week when it comes to Windows hardware updates. More recently, the company announced the retirement of Device metadata and WMIS, plus changes to driver signing. Now, Microsoft has announced Hardware Lab Kit (HLK) and Virtual Hardware Lab Kit (VHLK) May 2025 releases for Windows 11 24H2 and Server 2025.

Microsoft announces HLK and VHLK May 2025 releases for Windows 11 24H2 and Server 2025

The refreshed versions replace the original RTM version released last year in May. The update was quietly announced on May 6 through the company’s official blog:

Microsoft is pleased to announce that a refreshed HLK for Windows 11, version 24H2 and Windows Server 2025 is available starting May 6, 2025.

This release of the HLK contains test errata fixes, HLK test removals, and HLK test additions. All these changes will help keep the overall test quality high while helping reduce triage time for known test issues.

The refreshed version of the HLK will replace the RTM version that is available on the HLK download site. The VHLK version will be available in a week.

What’s HLK and VHLK

For the uninitiated, HLK stands for Hardware Lab Kit. Hardware makers generally use this tool to test and validate drivers before shipping them with Windows. If a driver passes all HLK tests, it can qualify for WHQL certification—Microsoft’s stamp of approval for hardware compatibility.

VHLK is pretty much the same thing, but designed to run in virtual environments. Think VMs, virtual hard disks, and lab automation—it’s all about testing without physical machines.

Both HLK and VHLK fall under the WHCP umbrella—the Windows Hardware Compatibility Program. That program ensures vendors can test their gear and software against current Windows builds (including older ones like Windows 10).

This latest HLK build also adds some new tests, including support for Bluetooth LE Audio and better handling of Generation 2 virtual machines when testing with VHLK.

If you’re working with drivers or hardware and want to stay compliant, now’s a good time to grab the updated tools. You’ll find more info in Microsoft’s full blog post.