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zeffy
2017-04-21 04:57:23 -07:00
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README.md
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## Preface
After reading [this article on gHacks](https://www.ghacks.net/2017/03/22/kb4012218-kb4012219-windows-update-processor-generation-detection/), I was inspired to look into these new rollup updates that Microsoft released on March 16. Among other things included in these updates, the changelog mentions the following:
After reading [this article on gHacks](https://www.ghacks.net/2017/03/22/kb4012218-kb4012219-windows-update-processor-generation-detection/), I was inspired to look into these new rollup updates that Microsoft released on March 16. Among other things, the changelog mentions the following:
> Enabled detection of processor generation and hardware support when PC tries to scan or download updates through Windows Update.
Which is essentially a giant middle finger to anyone who dare not "upgrade" to the steaming pile of garbage known as Windows 10.
This update marked the implementation of a [policy change](https://blogs.windows.com/windowsexperience/2016/01/15/windows-10-embracing-silicon-innovation/) 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.
There have even been people with Intel and AMD systems from 2015 who have allegedly been locked out of Windows Update because of these updates!
This is essentially a giant middle finger to anyone who dare not "upgrade" to the steaming pile of garbage known as Windows 10. Especially considering the extended support periods for Windows 7 and 8.1 still have a few years left, and will be coming to a close in 2020 and 2024 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](https://answers.microsoft.com/en-us/windows/forum/windows8_1-update/amd-carrizo-ddr4-unsupported-hardware-message-on/f3fb2326-f413-41c9-a24b-7c14e6d51b0c?tab=question&status=AllReplies)).
## Bad Microsoft!
@@ -85,9 +87,9 @@ We have found culprits, [`IsDeviceServiceable(void)`](https://gist.github.com/ze
## Solutions
`IsCPUSupported(void)` is only ever called by `IsDeviceServiceable(void)`, which is called by a few other functions. Luckily, there are a couple easy ways to kill this CPU check.
Luckily, there are a couple easy ways to kill this CPU check.
1. Patch `wuaueng.dll` and change `dword_600002EE948` (see [this line](https://gist.github.com/zeffy/e5ec266952932bc905eb0cbc6ed72185#file-isdeviceserviceable-c-L7)) which is at file offset `0x26C948`, from `0x01` to `0x00`. This makes `IsDeviceServiceable(void)` jump over its entire body and return 1 (supported CPU) immediately. This is my preferred method. **Note: this offset is only for the KB4012218-x64, for a list of all the patch offsets [click here](docs/Patch_Offsets.md).**
1. Patch `wuaueng.dll` and change `dword_600002EE948` (see [this line](https://gist.github.com/zeffy/e5ec266952932bc905eb0cbc6ed72185#file-isdeviceserviceable-c-L7)) which is at file offset `0x26C948`, from `0x01` to `0x00`. This makes `IsDeviceServiceable(void)` skip over the entire CPU check and return the value stored at `dword_600002EE94C`, which by default is 1 (supported CPU) immediately. This is my preferred method, as it is a simple 1-byte change. **Note: this offset is only for the KB4012218-x64, for a list of all the patch offsets [click here](docs/Patch_Offsets.md).**
2. Patch `wuaueng.dll` and `nop` out all the instructions highlighted [here](https://gist.github.com/zeffy/e5ec266952932bc905eb0cbc6ed72185#file-isdeviceserviceable-asm-L24-L26) in `IsDeviceServiceable(void)`, this will enable the usage of the `ForceUnsupportedCPU` of type `REG_DWORD` under the registry key `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Test\Scan` (you will most likely have to create this registry key). Set this value to `0x00000001` to force unsupported CPUs, and back to `0x00000000` to change the behaviour back to default. You will probably need to restart your PC or restart the `wuauserv` service in order for changes to apply. **This behaviour is an internal test feature used by Microsoft and could be removed in future updates, so I will not be providing xdelta files for it.**