How to replace acpi.sys with checked build acpi.sys in Windows 8.1?

I would like to do ACPI debugging in Windows 8.1.
When I replace acpi.sys with checked build acpi.sys, the system always restores it in next boot.
I followed the instructions mentioned in WDK document to disable Windows File Protection feature.

Create 'SFCDisable' registry DWORD value in \HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon.
and set the value to 2 (or 1).
Kernel debugger was attached as well.

However, the system still showed auto repair message in next boot.

Is there any step I miss?


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