The issue is reproducible on windows vista x86.
The issue is found since 8u20 b19, it is good with and before 8u20b18.
To reproduce:
1.Login with adminstrator prevelidge on a clean system
2.Install JRE via command line installer, provide no args
3.Add the following line into system level deployment file
deployment.security.level=HIGH
make sure it's locked - add key deployment.security.level.locked in the same file.
4.Uninstall the JRE.
5.Reinstall the JRE via command line installer, provide args args to set Security Level to Very High: "jre_installer.exe WEB_JAVA_SECURITY_LEVEL=VH."
expected behavior:
After installation, open JCP, check Security Level is set to Very High and still locked.

The actual result:
Security Level can't be set to Very High after reinstalling JRE:"jre_installer.exe WEB_JAVA_SECURITY_LEVEL=VH."