MP 1,1-5,1 High Sierra Install Trouble

[Durandrew]

Hi I have a 5,1 Mac Pro that has been modified for boot rom 144.0.0.0.0. Recently I had some trouble with my machine and reinstalled Sierra but when I go to install high Sierra I get the message in the pic "Your computer is missing firmware". I used to use Mojave so I don't understand why I can't reinstall High Sierra. Any tips or help would be greatly appreciated.

Thank You

 

[tsialex]

NVMe EFI module was injected in the past? SMBIOS spoofing?

 

[Durandrew]

I do have NVMe Drives and I do believe I loaded EFI for them. I have tried installing with NVMe drives disconnected as well but that doesn't work either. I am not sure what SMBIOS spoofing is, please explain if you don't mind. I am using a Highpoint ssd 7110 for my NVMe and raid if that helps.

 

[tsialex]

I do have NVMe Drives and I do believe I loaded EFI for them. I have tried installing with NVMe drives disconnected as well but that doesn't work either. I am not sure what SMBIOS spoofing is, please explain if you don't mind. I am using a Highpoint ssd 7110 for my NVMe and raid if that helps.

If you injected the NVMe EFI module inside the BootROM, you did a mess. Did you really did it?
What’s your current BootROM version?

Did you used OpenCore/Clover/or some hacked/patched install?

 

[Durandrew]

144.0.0.0.0 boot rom. I did not use open core or clover.
[automerge]1587314838[/automerge]

144.0.0.0.0 boot rom. I did not use open core or clover.

Is there a way to reflash the boot rom?
[automerge]1587315406[/automerge]
I’m not positive that I injected nvme module.

 

[tsialex]

Make a createinstallmedia HighSierra USB installer for 10.13.6, remove all drives except a SATA drive and see if you can do a clean install.

Download from Apple, use the links from the first post of the sticky:

MP5,1: What you have to do to upgrade to Mojave (BootROM upgrade instructions thread)

Please fully read this first post, you will probably find that you have one or more problems described into the various notes below. Mojave will only install if you have upgraded your BootROM to the current release and your Mac Pro have a Metal capable GPU*. If you are trying to install Mojave...

forums.macrumors.com

 

[h9826790]

Hi I have a 5,1 Mac Pro that has been modified for boot rom 144.0.0.0.0. Recently I had some trouble with my machine and reinstalled Sierra but when I go to install high Sierra I get the message in the pic "Your computer is missing firmware". I used to use Mojave so I don't understand why I can't reinstall High Sierra. Any tips or help would be greatly appreciated.

Thank You

Please try to install High Sierra inside the High Sierra RECOVERY PARTITION (not the normal OS desktop).

 

[Durandrew]

I stumbled upon an old hitachi drive that had high sierra installed on it and it booted fine so I cloned to my NVMe. I couldn't get the install to work but thank heavens I had the old drive and Thank You so much for all the help!