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My real Mac has natively four USB-C ports only, but with an external adapter I have three USB-A ports too. I have no problem formatting and preparing with modified EFI folder the installation drive (an USB-A or also an USB-C flash drive). The problem is how to transfer the EFI folder on the NVMe...

Ok, but how can I copy the EFI folder into the EFI partition after formatting the NVMe drive?

No, I have two Samsung 960 Pro NVMe SSD: the first one (with Windows 10 already installed) was already fitted on my X299 MB, the second one (that one earmarked for High Sierra) not yet: I tried to install High Sierra without success on the 2,5” SSD. Have I to clone the empty 2,5” SSD to Samsung...

I did so: 1) prepared on my MacBook Pro the USB flash drive following the point D3.) of the guide; 2) formatted the 2.5” SSD using the macOS Disk Utility and copied on the EFI partition the same - with Clover Configurator modified - EFI folder I have on the USB flash drive; 3) connected the...

I tried to install High Sierra on a standard SSD (SanDisk SSD plus 120 GB) waiting for cloning it to my NVMe Samsung 960 Pro disk, as suggested by @rugula. I followed exactly the guide, but at point D.4) 7.) the booting process definitively stops (after several intermediate interruptions): here...

Thank you, I will try that work around.

The guide at point D.4) - 1.) says: “In order to perform a clean install of macOS High Sierra 10.13.4 (17E199), prepare a virgin NVMe, SDD or HDD destination drive for the iMac Pro macOS installation by formatting the drive with HFS [(Mac OS Extended (Journaled)] and a GUID partition table by...

Hi! I’m trying to build the bootable USB flash drive; I’ve followed step by step the section D of the guide (page 1 of this thread) until the point D.3) 4.) where I read: “For successfully booting your iMac Pro macOS USB Flash Drive Installer, the latter must however also contain a valid EFI-...

It seems the card includes UEFI support (check mark near the sign “UEFI”)… Thank you for the tip!

I’m astounded how a reference point for the professional graphics could be “result of an outdated or crappy firmware implementation”…

My GPU (NVIDIA Quadro P4000) don't work without enabled CSM: the boot stops with three beeps.

@kgp, could you help me, please?

Can none help me?

Done!

I’m assembling a very similar computer to that kgp explains on the first post of this thread. The only differences are: Corsaire Vengeance LPX DDR4 2666 MHz 128 GB [CMK128GX4M8A2666C16] instead of Tridentz DDR-4 3200 Mhz 128 GB [F4-3200C14Q2-128GTZSW]; 2 x Samsung 960 PRO NVMe M.2 1TB...