Hi
@Troy.Blackburn,
Thanks for your message. I believe I have found what the issue behind it is.
Missing Kernel > Emulate patches for 9th gen and a few other things! In the EFI I'd sent you earlier was designed for later OSes like Monterey and Ventura but not High Sierra specific settings. So I'd gone back to the drawing board so to speak and rebuilt the EFI purely for High Sierra, so I've gone ahead and done that for you.
I would also like to mention I'd noticed you have missing MLB and ROM fields in your original EFI under the PlatformInfo. You must (re)populate these somehow. ROM can be found as the MAC address of your Ethernet card under Windows. MLB I believe is generated by the system.
Anyway here's the updated EFI. Give it a try.
(Update to this posted below this post)
Greetings Middleman,
Apologies for the very delayed reply. As it happens so often, Life is what happens when you have other plans and I got busy with other and more pressing priorities, so I had to put this one the back burner for a while. I wasn't even aware that there had been anymore posts to this thread since my last post. Regardless, I'm back to working on this.
Thank you very much for your continued help and the updated EFI. I tried it and it still throws me into recovery mode. I have found an EFI folder designed for use with a MSI Z590-A Pro which seems to "work" in my system running High Sierra 10.13.6. My current hardware config is listed below for reference:
Gigabyte Z590 AORUS Master
I7 11700K
32GB
AMD RX580
Fenvi FV-T919
I'd imagine there are some tweaks that could/should be made to the EFI for my config. Overall the system works, with some limitations:
USB - All I/O panel and front panel (using a motherboard USB3 header) ports will recognize an older PNY USB 2.0 Flash Drive or a USB connected Apple Magic Keyboard and Trackpad; however, fails to recognize any USB 3.x devices when connected.
Bluetooth - Gives the appearance of working on screen; however, when I disconnect the keyboard/trackpad from the USB port, it fails to connect via Bluetooth.
I'm attaching the "MSI" EFI that I'm currently using and printouts from the Bluetooth & USB System Information. The Boot Error Log is from when attempting to boot with your EFI folder.
Thank You
Troy
P.S. for those that might say, just run a more current version of macOS, my intent is to eventually upgrade to a more current version; however, for the moment, I'm limited to High Sierra because of some apps I'm running on it.