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Oct 14, 2015 1:42 PM in response to malembenignby alex_h1,Hello malembenign,
Thanks for using Apple Support Communities.
If I understand your post correctly, you're concerned about the OS of your Mac changing when you install the Mac EFI Security Update 2015-001. Installing this update has zero impact on the OS that you Mac is running on. In order to use a newer OS, you would need to manually update to it via the App Store. If you'd like to learn more about what is in the Mac EFI Security Update 2015-001, then please see the link below:
About the security content of Mac EFI Security Update 2015-001 - Apple Support
Take care.
