MP 1,1-5,1 Installing Sonoma

[Hamid92]

Hi All,
I have a Mac Pro 4.1 flashed to 5.1. CPU 2x2.26, 32 GB of RAM, Rx 580 graphics card, running MacOS High Sierra HD and Mojave SSD. I wanted to install Sonoma on an SSD via OCLP 2.4.1, the latest version. Create the MacOS Sonoma plus OpenCore installer on an external drive. Once the external drive was ready, I restarted the Mac as recommended by OCLP to boot from the external drive by pressing the Alt key. However, when I restart and press the Alt key, I get a black screen that prevents me from continuing with the installation.

Could someone please help me?

 

[tsialex]

You need pre-boot configuration suport, no pre-boot configuration support equals no native BootPicker. Without native BootPicker you can't select the OCLP Sonoma installer.

You won't have native BootPicker support with a PC GPU, your RX 580 will only work after macOS/Windows/Linux loads the GPU drivers.

To overcome this limitation you'll need to inject EnableGop EFI module to the MacPro firmware or to the GPU firmware to have pre boot configuration support with your UEFI GOP supported GPU.

This is the reference thread about EnableGop, do not forget that any error will brick your Mac Pro and that the GPU is required to be with the factory firmware, no mining or any other mods.

EnableGop: Pre-OpenCore GOP support for EFI-era iMacs and Mac Pros

You wait ten years for a driver to enable pre-boot graphics on unsupported GPUs in EFI era Macs, and then two come along at once... This post is to announce a firmware driver to enable the native Apple boot picker and early macOS boot progress bar (plus other parts of the firmware UI: target...

forums.macrumors.com

Btw, the search box is your friend, no need to open another thread for things answered multiple times in the past.

 

[Hamid92]

After several attempts to install Monterey, Sonoma, and Sequoia on my Mac Pro flashed to 5,1 with Boot ROM 144.0.0.0.0, and still not having multi-boot nor a boot screen, I tried to enable EnableGOP from Mojave with a Sapphire Pulse Radeon RX 580 4 GB installed.
The activation completed successfully, but after rebooting and pressing the ALT (Option) key, I still do not get any boot screen.
What can I do?

 

[tsialex]

Tried re-flashing your GPU to the factory GPU firmware?

that the GPU is required to be with the factory firmware, no mining or any other mods.

https://forums.macrumors.com/posts/32671327/