T2 Macs don’t count as external boot media

I don’t see this documented anywhere in an officially explicit way, so I’m writing a blog post on this. With the introduction of T2-chip Macs, Apple introduced something called Startup Security Utility, and the official line there is that you can change the setting to “Allow booting from external media,” and then you can boot… Continue reading T2 Macs don’t count as external boot media