I have a very similar configuration but I'm having issues to boot into the Catalina Installer.
This is my Desktop configuration:
Motherboard : Gigabyte B360M AORUS Gaming 3 rev 1.0 (Not the WIFI version)
CPU: Intel Core i5 - 9600KF
RAM: Corsair ballistix 32 GB 3200MHz
IGPU: None
Graphics: AsRock Radeon RX 5500 XT 4GB
SSD: Adata XPG SX6000, 1TB, M.2 NVMe
HD: Sata Seagate Barracuda 6gb
Audio: Realtek ALC 892
WiFi / Bluetooth: Broadcom bcm94331running on a PCI Express X1 Adapter
Display: Samsung U28E590 28" (3840x2160)
I'm attaching what I see on my screen after using the recommended boot args (-v nv_disable=1 slide=0 ) - two images.
I'm attaching my current config.plist file (but its virtually the same as the suggested one, I've downloaded it from
https://www.elitemacx86.com/threads/guide-creating-a-basic-config-plist-file-for-booting-macos.257/ and replaced "iMac 17,11" by "iMac Pro 1,1" on both "Family" and "Product Name" values.
Could you possible help me
@EliteMacx86 @Striker ? Thank you!
PS: I already have a Windows 10 installed on the same NVME drive, but it shouldn't be an issue since the EFI folder has 200mb and I have 500gb of free space on the NVME so that I can create the APFS partition.