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zeffy
2017-04-21 06:11:33 -07:00
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@@ -87,11 +87,11 @@ We have found culprits, [`IsDeviceServiceable(void)`](https://gist.github.com/ze
## Solutions
Luckily, there are a couple of different ways to kill this CPU check.
Luckily, there are a couple of different ways to kill this CPU check by patching `wuaueng.dll`.
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 immediately return the value stored at `dword_600002EE94C`, which by default is 1 (supported CPU). 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).**
1. Change the value of `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 immediately return the value stored at `dword_600002EE94C`, which by default is 1 (supported CPU). 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.**
2. Fill all the instructions highlighted [here](https://gist.github.com/zeffy/e5ec266952932bc905eb0cbc6ed72185#file-isdeviceserviceable-asm-L24-L26) in `IsDeviceServiceable(void)` with `nop`s. 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). You can set this value to `0x00000001` to force unsupported CPUs, or to `0x00000000` to use the default behaviour. You will probably need to restart your PC or restart the `wuauserv` service in order for changes to apply. **This is an internal testing feature used by Microsoft and could be removed in future updates, so I will not be providing xdelta files for it.**
## Caveats