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How wufuc works
Inside a system file called wuaueng.dll, there are two functions responsible for the CPU check:
IsDeviceServiceable and IsCPUSupported.
IsDeviceServiceable simply calls IsCPUSupported once, and then saves the result and re-uses it on subsequent calls.
I take advantage of this behavior in wufuc by patching the saved result so that it is always TRUE, or supported.
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