Yes: https://support.apple.com/guide/security/uefi-firmware-security-in-an-intel-based-mac-seced055bcf6/web https://support.apple.com/guide/security/uefi-firmwa

Yes: https://support.apple.com/guide/security/uefi-firmware-security-in-an-intel-based-mac-seced055bcf6/web https://support.apple.com/guide/security/uefi-firmware-secur... In any case, EFI is still well-supported by OS installers. iBoot is not.