Before booting from the USB, you must disable Apple’s security locks:
Technically, you don't "jailbreak" a MacBook Pro 2012 the same way you do an iPhone. While iOS is a "walled garden" that requires an exploit to gain root access, macOS is already an open system where you can install third-party apps and modify system files officially. jailbreak macbook pro 2012
Bypassing these locks is a legal grey area and should only be performed on hardware you legally own. Before booting from the USB, you must disable
This upgrade alone makes the 2012 MacBook Pro feel faster than a brand-new base-model MacBook Air for general navigation. Before booting from the USB