Step 2: Boot Mac in the Recovery Mode. Once you have taken a backup of your Mac data, you need to restart in the recovery mode. The Mac Recovery Mode is a dedicated module in the operating system that provides all kinds of firmware and disk-related options. Mac OS X is the UNIX-based operating system that contains a Mach 3 microkernel and a FreeBSD-based subsystem. Its user interface is Apple-like, whereas the underlying architecture is UNIX-like. Mac OS X offers a novel technique to create a forensic duplicate.

Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by a product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

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If your macOS isn't up to date, you may be able to update to a later version.

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

Os Operating Systems List

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.