Here is a complete guide to inserting EnableGOP into a VBIOS using macOS.

What Is EnableGOP?

EnableGOP is a UEFI driver, maintained by Acidanthera as part of OpenCorePkg, that enables the native Apple EFI boot picker on Mac Pro 4,1/5,1 systems with non-Apple GPUs. By injecting it into your GPU’s VBIOS, you get a proper EFI bootscreen without needing an expensive pre- flashed card. The modification script (vBiosInsert.sh) runs entirely on macOS.

Supported GPU Architectures

GPU Family	Notes
NVIDIA Kepler	Some low-end cards need EnableGopDirect; GOP Update recommended
NVIDIA Maxwell/Pascal	Requires NVIDIA Web Drivers under macOS; GOP Update recommended
AMD GCN HD 7xxx–RX 3xx)	Generally works without extra steps
AMD Polaris RX 4xx–5xx)	GOP Update may be required
AMD Vega	Some cards need EnableGopDirect variant
AMD Navi RX 5xxx–6xxx)	May require further VBIOS modification

Step 1 Get the VBIOS

You have two options:

DownloadfromTechPowerUp— go to techpowerup.com/vgabios, filter by your card model, and download the matching ROM. This is the easiest method for macOS users.

Dumpfromyourcard— NVFlash NVIDIA) and AMDVBFlash AMD) only run on Windows, Linux, or DOS, so you’ll need a second machine or a VM if you want to dump your own card’s current VBIOS. ¹

Step 2 — Optional) Update the GOP Driver

Updating the GOP inside the VBIOS before inserting EnableGOP adds features like DisplayPort 1.4 and fixes bugs. This step requiresWindows (a VM works fine):

• Download the GOPUpdate Utility from WinRAIDLevel1Techs.
• Drag and drop your .rom file onto GOPupd.bat and follow the prompts.

Step 3 Insert EnableGOP (macOS)

This is the core step that can be done natively on macOS ¹

Download OpenCorePkg and locate EnableGop/ inside Utilities/. Also grab efirom from

^{Utilities/BaseTools/}

Download UEFIRomExtract from the IMACEFIBOOTSCREENrepo.

export PATH=”$PATH:/path/to/folder” Place efirom and UEFIRomExtract in the same folder and add it to your PATH temporarily:

Install grep via Homebrew (macOS’s built-in grep may not work):

Open Terminal, drag vBiosInsert.sh into it, then append the arguments: ¹

Use -a for AMD, -n for NVIDIA Drag in your VBIOS .rom file

Drag in EnableGop.efi (or EnableGopDirect.efi if the standard one doesn’t work) Type your desired output filename

./vBiosInsert.sh -n ./NVIDIAVBIOS.rom ./EnableGop.efi ./NVIDIAVBIOS_EnableGop.rom Your final command should look like this:

Press Enter. Your modified VBIOS file is now ready.

⚠ AMDsizelimitation: If you get a size truncation error, your card needs VGA code stripped from the VBIOS first. See the DeletingtheVGAwiki for guidance.

Step 4 Flash the Modified VBIOS

Flashing must be done on WindowsorLinux: ¹

NVIDIA: Use NVFlash. A video guide is available on YouTube.

AMD: Use AMDVBFlash. Command-line syntax is documented in the TechPowerUp forums.

Always back up your original VBIOS before flashing, and understand that flashing GPU firmware carries a risk of bricking the card if something goes wrong.