High Sierra Install (Open Core) This version of OS X is not supported on this platform

[jaylongeee]

I am trying to do a freash install 10.13.6 onto an older machine I have.

I get the following message:

This version of OS X is not supported on this platform
Mac-AA95B1DDAB278895

I have searched this and most result refer to SMBIOS being used incorrectly

I have tried MacPro4,1 MacPro5,1 iMac15,1 iMac16,1 iMac17,1 iMacPro1,1 SMBIOS variations

I have tried using Open Core 0.5.7 and 0.6.3 as i read OC stopped supporting High Sierra from 0.5.7 (though I dont know how true that is).

I have sucessfully installed 10.15.7 (OC 0.6.3) and 11.0.1 (OC 0.6.4) on other machines no problem.

I did have it working properly with clover originally for a few years, but I mistakenly wiped it recenlty and have become more in tune with Open Core, so trying stay down that route.

But I am stumped here.

Machine Spec:
Intel Core i7 7800X, S 2066, Skylake-X, 6 Core
Asus Tuf X299 MARK 2, Intel X299, A 2066
NVIDIA GTX 1080Ti 11GB
Crucial ballistix sport 128GB (16x8) DDR4 2400MHZ RAM

if anyone has any suggestions, they'd be welcomed.

Have attached 0.6.3 EFI file.

Thanks.

 

[Railgun]

I have seen elsewhere they used OC 0.5.8 and SMBIOS iMac 18,3 with very similar specs but it was on a Gigabyte Z390.

 

[jaylongeee]

I have seen elsewhere they used OC 0.5.8 and SMBIOS iMac 18,3 with very similar specs but it was on a Gigabyte Z390.

Thanks. I gave it a try but no joy.

Wonder if it has anything to do with my BIOS as I upated it to latest version.

 

[Edhawk]

You need an X299 guide, as your older system is not a standard desktop system. Have a read of this guid by KGP over at Tonymacx86 - https://www.tonymacx86.com/threads/...ojave-successful-build-extended-guide.255082/

This is a lot more involved than a standard desktop hack, due to the high end components and other non-standard components these boards use. They normally run well with iMac Pro 1.1. SMBIOS as they don't have n IGPU but rely on the discrete GPU for all graphics processing.

 

[jaylongeee]

You need an X299 guide, as your older system is not a standard desktop system. Have a read of this guid by KGP over at Tonymacx86 - https://www.tonymacx86.com/threads/...ojave-successful-build-extended-guide.255082/

This is a lot more involved than a standard desktop hack, due to the high end components and other non-standard components these boards use. They normally run well with iMac Pro 1.1. SMBIOS as they don't have n IGPU but rely on the discrete GPU for all graphics processing.

Thanks. I will take a read later in the week and give it a re-try over the weekend.