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

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

Use the latest stable BIOS

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.