Work-around to BIOS updates with macOS Big Sur

[khronokernel]

With macOS Big Sur, Apple will now apply BIOS updates regardless of run-efi-updater variable presence. For PCs, we simply block MultiUpdater.efi however on legacy Macs running OpenCore with SMBIOS spoofing this is not enough. For some machines, they'll simply soft brick them where a battery removal will easily resolve. With iMac14,x machines, setting a new SMBIOS will actually apply this update and succeed ending with a bricked Mac.

To work around this, setting BIOSVersion to 999.000.000 works well enough. Would be ideal to add a new entry to PlatformInfo -> Generic for users to easily set custom values without having to build an entirely new SMBIOS table

[1alessandro1]

With macOS Big Sur, Apple will now apply BIOS updates regardless of run-efi-updater variable presence.

Setting this variable is irrelevant from macOS 11.0 and newer, is this safe to remove if one is planning to use only Big Sur?

[vit9696]

Yes.