Hackintosh:

EFI made for MSI B550I MPG (ITX) Gaming Edge / Gaming Edge Max with Opencore bootloader

System specifications:

Component	Model
CPU	AMD Ryzen 5 5600X
RAM	16GB (2x8GB) DDR4 Crucial Ballistix @3600MHz
DGPU	AMD Sapphire Nitro RX 590 8gb
Monitor	AOC Q3279WG5B QHD (2k) 75Hz
SSD	NVMe Samsung 970 Evo 1TB
Audio	Realtek ALC S1200A
Wireless	Intel AX200 (wifi+bluetooth)
Ethernet	Realtek 8125B 2.5Gbit LAN

Current OpenCore version: 0.8.1

macOS version:

• Big Sur 11.6

Probably you can also boot catalina and monterey (require newer bluetooth kext). Not tested

What Works:

• Wi-Fi
• Bluetooth
• Ethernet
• dGPU (mine supported natively)
• Audio
• All usb
• Sleep/Wake up

What Doesn't Work:

• Seem nothing

BIOS setting:

• Secure Boot -> Disabled
• CFG Lock -> Disabled
• SATA Mode -> AHCI
• Above 4G Decoding -> Enabled 
• EHCI/XHCI Hand-off -> Enabled
• SVM -> Enabled
• CSM -> Disabled
• Resizable BAR Support -> Disabled

Use the latest stable BIOS

Installation:

• See Dortania guide -> https://dortania.github.io/OpenCore-Install-Guide/installer-guide/
• Use my EFI for boot and install macOS
• Generate yours personal SMBIOS data for iMacPro1,1
• with TextEdit put the generated MLB, SerialNo and UUID in PlatformInfo section of config.plist in OC folder

That's all.