wufuc

Disables the "Unsupported Hardware" message in Windows Update, and allows you to continue installing updates on Windows 7 and 8.1 systems with Intel Kaby Lake, AMD Ryzen, or other unsupported processors.

Downloads

You can get the latest stable version here!

If you are feeling brave, you can try the latest unstable builds here. Use these at your own risk!

Reporting an issue

Before you create an issue, please make sure of the following:

• Are you using the latest version?
• If you previously used the old batchfile patches, did you revert it by running repair_wuaueng.dll.bat?
• Have you tried restarting your computer?

There isn't really a way for wufuc to directly interact with your desktop, because it runs outside the context of a normal user session. Therefore you must first download and run another program called DebugView (from Microsoft) to display wufuc's debug messages. These logs are absolutely crucial if you want me to be able to resolve your issue as quickly as possible, so please include them if you can.

The best way to get a log of the entire life-cycle of wufuc is to do the following:

1. Start Dbgview.exe as administrator and check Capture -> Capture Global Win32.
2. Restart wufuc and wuauserv by running debugview_helper.bat as administrator.
3. Output will be shown in DebugView, copy/paste this text into your issue.

Other helpful information to include when reporting issues:

• What happened? What did you expect to happen instead?
• What build are you using? Stable release or unstable AppVeyor builds?
• What version of Windows are you using? Windows 7 or 8.1? x64 or x86?
• Were there any errors reporting during installation? What were they?
• What is the file version or SHA-1 hash of C:\Windows\System32\wuaueng.dll?
• Any other information you feel is relevant to your issue.

Preface

The changelog for Windows updates KB4012218 and KB4012219 included the following:

Enabled detection of processor generation and hardware support when PC tries to scan or download updates through Windows Update.

These updates marked the implementation of a policy change they announced some time ago, where Microsoft stated that they would not be supporting Windows 7 or 8.1 on next-gen Intel, AMD and Qualcomm processors.

It was essentially a big middle finger to anyone who decides to not "upgrade" to the steaming pile of 💩 known as Windows 10. Especially considering the extended support periods for Windows 7 and 8.1 won't be ending until January 4, 2020 and January 10, 2023 respectively.

There have even been people with older Intel and AMD systems who have been locked out of Windows Update because of these updates (see #7 and this).

Bad Microsoft!

If you are interested, you can read my original write up on discovering the CPU check here.

Basically, inside a file called wuaueng.dll there are two functions: IsDeviceServiceable(void) and IsCPUSupported(void). IsDeviceServiceable(void) is essentially a wrapper around IsCPUSupported(void) that caches the result it recieves and recycles it on subsequent calls.

My patch takes advantage of this result caching behavior by setting the "hasn't run once" value to FALSE and the cached result to TRUE.

How it works

• At system boot the wufuc scheduled task runs as the NT AUTHORITY\SYSTEM user.
• wufuc determines what service host group process the Windows Update service runs in (typically netsvcs), and injects itself into it.
• Once injected, it applies a hook to LoadLibraryEx that automatically patches wuaueng.dll when it is loaded.
• Any previously loaded wuaueng.dll is also patched.

Several improvements over my batchfile method:

• No system files are modified!
• Heuristic-based patching, which means it will usually keep working even after new updates come out.
• C is best language.
• No external dependencies.

Q & A

How to install/uninstall?

Just download the latest release, and extract the wufuc folder to a permanent location (like C:\Program Files\wufuc) and then run install_wufuc.bat as administrator.

To uninstall run uninstall_wufuc.bat as administrator.

How to update when a new version comes out?

Unless otherwise noted, you should only have to:

• Run uninstall_wufuc.bat as administrator.
• Copy the new files into the install folder, overwriting the old ones.
• Run the new install_wufuc.bat as administrator.

How do I remove your old patch and use this instead?

I've included a utility script called repair_wuaueng.dll.bat. When you run it, it will initiate an sfc scan and revert any changes made to wuaueng.dll.