Hi, I'm having a problem updating my Mac Pro 4.1> 5.1. Currently I have Sierra 10.12.6 with EFI MP51.007F.B03. I decided to go to 10.13.4 and I downloaded it from the Appstore.
My MacPro being equipped with a RX580 I removed it to install the original GT120.
I have an AHCI SSD on PCI card that is still in the Mac. The problem is that when the installer offers to click on "Turn off" to update the EFI, I enter my password but nothing happens and the Macpro does not stretch. I tried to maintain the "power" button but the EFI update does not work.
I have tried from my main AHCI disk or from an SSD also equipped with Sierra but it does not work. If I access the "FirmwareUpdate" file of the High Sierra package I have the same message as bsbeamer # 76. For now I download again 10.13.4 from the Appstore but I'm afraid it does not change anything.
My MacPro being equipped with a RX580 I removed it to install the original GT120.
I have an AHCI SSD on PCI card that is still in the Mac. The problem is that when the installer offers to click on "Turn off" to update the EFI, I enter my password but nothing happens and the Macpro does not stretch. I tried to maintain the "power" button but the EFI update does not work.
I have tried from my main AHCI disk or from an SSD also equipped with Sierra but it does not work. If I access the "FirmwareUpdate" file of the High Sierra package I have the same message as bsbeamer # 76. For now I download again 10.13.4 from the Appstore but I'm afraid it does not change anything.