So the “jailbreak” equivalent here is .

This upgrade alone makes the 2012 MacBook Pro feel faster than a brand-new base-model MacBook Air for general navigation.

You cannot "jailbreak" a MacBook Pro 2012 in the traditional iOS sense because macOS is not a "walled garden" in the same way iOS is. You already have root access, the ability to run unsigned code, and full control over the file system.