Uninstalling protected service.

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Windows

service

protected

The requirement of my project is to install and run my service as protected and uninstall this protected service.

I have tried implementing the protected anti malware service referring the following msdn post:

https://msdn.microsoft.com/en-us/library/windows/desktop/dn313124(v=vs.85).aspx

I have successfully installed the protected service with the help of ELAM as mentioned in the post. Now I want to uninstall this protected service. 

Using the same protected service while uninstalling ChangeServiceConfig2 fails with error(5) Access Denied, when I try to set SERVICE_LAUNCH_PROTECTED_INFO from SERVICE_LAUNCH_PROTECTED_ANTIMALWARE_LIGHT to SERVICE_LAUNCH_PROTECTED_NONE, the service handle provided to this function has SERVICE_ALL_ACCESS rights.

How can we mark this service as unprotected with help of ChangeServiceConfig2 and uninstall the service?

What I have tried:

To uninstall this service we need to mark it as unprotected. We can mark this service as unprotected with help of registry by modifying "LaunchedProtected" value from 3 to 0 at registry path "HKLM\System\CurrentControlSet\Services\Test Service".