### [If you are looking for the latest patch files, you can find them here!](https://github.com/zeffy/kb4012218-19/releases)

### [Click here for a list of the Windows updates supported by the patch](docs/Supported Updates.md)

---

## 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:

> 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.

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!

## Bad Microsoft!

I started by downloading the `.msu` package for my system (in my case, it was `windows6.1-kb4012218-x64_590943c04550a47c1ed02d3a040d325456f03663.msu`)

I extracted it using the command line `expand` tool:

```bat
md "windows6.1-kb4012218-x64"
expand -f:* ".\windows6.1-kb4012218-x64_590943c04550a47c1ed02d3a040d325456f03663.msu" ".\windows6.1-kb4012218-x64"
cd ".\windows6.1-kb4012218-x64"
md "Windows6.1-KB4012218-x64"
expand -f:* ".\Windows6.1-KB4012218-x64.cab" ".\Windows6.1-KB4012218-x64"
```

Great, now there's thousands of files to sort through! Just kidding. Sort of. Maybe. :thinking:

I ended up using PowerShell to sort through and filter out all the binaries that weren't related to Windows Update, like so:

```powershell
Get-ChildItem -Filter "wu*" -Exclude "*.mui" -Recurse | ForEach-Object { $_.FullName }
```

That narrowed it down to 14 files, excellent!

Next, I started comparing these binaries with the ones already on my system with [BinDiff] and [Diaphora]. I eventually got to `wuaueng.dll`, which turned up quite a few interesting new functions:

EA | Name | Basicblock | Instructions | Edges 
-- | ---- | ---------- | ------------ | -----
`00000600001DCB9C` | ``CWUTelemetryDownloadCanceledEvent::FireAsimovEvent(void)`` | 36 | 446 | 53
`00000600001D8F98` | ``CWUTelemetryDownloadCanceledEvent::`scalar deleting destructor'(uint)`` | 3 | 15 | 3
`00000600001D8FD0` | ``CWUTelemetryDownloadEvent::CWUTelemetryDownloadEvent(void)`` | 1 | 58 | 0
`00000600001DAEDC` | ``CWUTelemetryDownloadEvent::Init(CReporter *,long,long,ushort const *,long,_GUID,_GUID,CReportingOptionalValues &,AsimovDataInAddition *)`` | 6 | 50 | 8
`00000600001DAFB8` | ``CWUTelemetryDownloadEvent::InitializeMemebersFromOptionalData(tagOptionalData *)`` | 27 | 91 | 40
`00000600001D9100` | ``CWUTelemetryDownloadEvent::~CWUTelemetryDownloadEvent(void)`` | 2 | 60 | 1
`00000600001DC2C4` | ``CWUTelemetryDownloadFailedEvent::FireAsimovEvent(void)`` | 36 | 446 | 53
`00000600001DB114` | ``CWUTelemetryDownloadStartedEvent::FireAsimovEvent(void)`` | 36 | 446 | 53
`00000600001DB9EC` | ``CWUTelemetryDownloadSucceededEvent::FireAsimovEvent(void)`` | 36 | 446 | 53
`00000600001D8C48` | ``CWUTelemetryEventFactory::FireTelemetryEvent(CReporter *,long,long,ushort const *,long,_GUID,_GUID,CReportingOptionalValues &,AsimovDataInAddition *)`` | 11 | 76 | 17
`00000600001D8574` | ``CWUTelemetryEventFactory::GetTelemetryEvent(CReporter *,long,long,ushort const *,long,_GUID,_GUID,CReportingOptionalValues &,AsimovDataInAddition *,CWUTelemetryEvent * *)`` | 77 | 395 | 127
`00000600001DEE7C` | ``CWUTelemetryInstallCanceledEvent::FireAsimovEvent(void)`` | 34 | 409 | 50
`00000600001D8DD4` | ``CWUTelemetryInstallEvent::CWUTelemetryInstallEvent(void)`` | 1 | 57 | 0
`00000600001DD474` | ``CWUTelemetryInstallEvent::Init(CReporter *,long,long,ushort const *,long,_GUID,_GUID,CReportingOptionalValues &,AsimovDataInAddition *)`` | 6 | 50 | 8
`00000600001DD550` | ``CWUTelemetryInstallEvent::InitializeMemebersFromOptionalData(tagOptionalData *)`` | 23 | 81 | 34
`00000600001D8EFC` | ``CWUTelemetryInstallEvent::~CWUTelemetryInstallEvent(void)`` | 2 | 66 | 1
`00000600001DE67C` | ``CWUTelemetryInstallFailedEvent::FireAsimovEvent(void)`` | 34 | 409 | 50
`00000600001DF67C` | ``CWUTelemetryInstallRebootPendingEvent::FireAsimovEvent(void)`` | 34 | 409 | 50
`00000600001D8D9C` | ``CWUTelemetryInstallRebootPendingEvent::`scalar deleting destructor'(uint)`` | 3 | 15 | 3
`00000600001DD67C` | ``CWUTelemetryInstallStartedEvent::FireAsimovEvent(void)`` | 34 | 409 | 50
`00000600001DDE7C` | ``CWUTelemetryInstallSucceededEvent::FireAsimovEvent(void)`` | 34 | 409 | 50
`00000600001CAE68` | ``CWUTelemetryScanFailedEvent::FireAsimovEvent(void)`` | 31 | 416 | 46
`00000600001CA100` | ``CWUTelemetryScanRetryEvent::FireAsimovEvent(void)`` | 9 | 108 | 13
`00000600001CA588` | ``CWUTelemetryScanSucceededEvent::FireAsimovEvent(void)`` | 47 | 459 | 73
`00000600001CB790` | ``CWUTelemetryUnsupportedSystemClickSupportEvent::FireAsimovEvent(void)`` | 5 | 22 | 7
`00000600001CB9B0` | ``CWUTelemetryUnsupportedSystemClickSupportEvent::`scalar deleting destructor'(uint)`` | 3 | 17 | 3
`00000600001CB7FC` | ``CWUTelemetryUnsupportedSystemDetectionEvent::FireAsimovEvent(void)`` | 5 | 22 | 7
`00000600001CB970` | ``CWUTelemetryUnsupportedSystemDetectionEvent::`scalar deleting destructor'(uint)`` | 3 | 17 | 3
`00000600001CB724` | ``CWUTelemetryUnsupportedSystemNotificationDismissEvent::FireAsimovEvent(void)`` | 5 | 22 | 7
`00000600001CB9F0` | ``CWUTelemetryUnsupportedSystemNotificationDismissEvent::`scalar deleting destructor'(uint)`` | 3 | 17 | 3
`00000600001CB6B8` | ``CWUTelemetryUnsupportedSystemNotificationShowEvent::FireAsimovEvent(void)`` | 5 | 22 | 7
`00000600001CBA30` | ``CWUTelemetryUnsupportedSystemNotificationShowEvent::`scalar deleting destructor'(uint)`` | 3 | 17 | 3
**`0000060000102F08`** | **``IsCPUSupported(void)``** | **20** | **157** | **31**
**`00000600000AF3C0`** | **``IsDeviceServiceable(void)``** | **7** | **31** | **8**
`00000600000832CC` | ``TraceLoggingEnableForTelemetry(_TlgProvider_t const *)`` | 16 | 86 | 23
`0000060000083210` | ``TraceLoggingSetInformation(_TlgProvider_t const *,_EVENT_INFO_CLASS,void *,ulong)`` | 6 | 50 | 8

We have found culprits, [`IsDeviceServiceable(void)`](https://gist.github.com/zeffy/e5ec266952932bc905eb0cbc6ed72185) and [`IsCPUSupported(void)`](https://gist.github.com/zeffy/1a8f8984d2bec97ae24af63a76278694)!

## 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.

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: these offsets are only for the Windows 7 x64 version.**

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.**

## Caveats

- You have to apply a new patch whenever `wuaueng.dll` gets updated.
- SFC scan errors will most likely occur as it will believe the integrity of the system has been compromised.

[KB4012218]: https://www.catalog.update.microsoft.com/search.aspx?q=kb4012218
[KB4012219]: https://www.catalog.update.microsoft.com/search.aspx?q=kb4012219
[KB4015546]: https://www.catalog.update.microsoft.com/search.aspx?q=KB4015546
[KB4015547]: https://www.catalog.update.microsoft.com/search.aspx?q=KB4015547
[KB4015549]: https://www.catalog.update.microsoft.com/search.aspx?q=KB4015549
[KB4015550]: https://www.catalog.update.microsoft.com/search.aspx?q=KB4015550
[BinDiff]: https://www.zynamics.com/software.html
[Diaphora]: http://diaphora.re