Leaving ‘external boot allowed’ is a risk that if stolen, someone might be able to access the internal drive.Not sure if it is a linux driver issue or some sort of on chip security, but so far, no access. You may not have any access to the internal drive.
(we’re uncertain of other workarounds for grub at this time) Plug in your bootable USB device and boot up your 2018 2019 Macbook Pro from USB, hold the Command (⌘) key and you’ll see the startup disk screen, select the USB and boot it up. Select ‘Startup Security Utility’ and you’ll get this screen…Ĭhange the settings for both to the same as the image above.Įxternal Boot to Allow booting from external media
Yaaay! You entered a secret level with hidden powers!Ĭlick on Utlities (on the menu bar at the top of the screen, don’t click on Disk Utlities in the middle of the screen) Keep holding them through the chime sound until you see the Recovery Screen below… To access Recovery Mode, turn off your Macbook, turn it on and hold the Command (⌘) and R keys. You CAN boot a 2018 to 2021 Macbook Pro from USB!īut it does take a few steps to get there.
Starting in 2018 the Macbook Pro includes a secure boot chip that prevents your Macbook from booting windows, linux, BSD, gentoo, Fedora, Atlas Supervisor, other Mac O/S/s on a usb, etc.
