BIOS setting UEFI or UEFI+Legacy

Jun 3, 2018
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Hi,

My brand new build (i5-8400, MSI H310M-PRO-VD mobo, 8GB DDR4-2400, 1TB-SATA-HDD) is showing the current BIOS setting (before any OS installation) as "UEFI+Legacy".

My intent is to initially install Linux (Ubuntu), but shortly also multi-boot into Windows 10, and MacOS (as per tonymacx86.com instructions, using genuine, licensed macOS). In such a case, should I keep the BIOS setting as "UEFI+Legacy", or turn to "UEFI" only ?

My understanding is that once switched to "UEFI", and OS installation done, changing back the BIOS setting to "UEFI+Legacy" (or at least pure "Legacy", which I don't see as an option in MSI's BIOS screen) - is not an option. Thus wanted to be sure, before running into conflicts.

TIA.
 
I have an "aside" question, how do you manage to license "genuine MacOS" if Apple's T&C expressly forbids it on non-Apple hardware?

As for your other question, if you install using UEFI-only, you'd have to re-install to switch to UEFI_Legacy and I believe the UEFI+legacy option is the only option since Windows 10 "kind-of" mandates UEFI install on UEFI-capable hardware. I'm open to someone more knowledgable on UEFI correct me on this, as I still can't fully wrap my head around UEFI and the interaction with locking down the OS.