Try using the EFI attached below. It is base on OC 0.9.1. It was created for another user with a similar X570 MB, 8-core CPU and Navi dGPU.
You will need to add the MLB, ROM, Serial Number and SystemUUID to the Generic section of the config.plist. Do this before you try to use it.
As you don't say which X570 board you are using the Ethernet kext installed in the /EFI/OC/Kexts folder and detailed in the config.plist may not work with your motherboard's Ethernet controller.
You will need to add the MLB, ROM, Serial Number and SystemUUID to the Generic section of the config.plist. Do this before you try to use it.
As you don't say which X570 board you are using the Ethernet kext installed in the /EFI/OC/Kexts folder and detailed in the config.plist may not work with your motherboard's Ethernet controller.