I'll try tomorrow. Thanks! I'm on one of my real Macs now. Where
exactly should I place that (#2) Config.plist in my Hack? And should it be places twice into two different folders? When someone writes "EFI" it needs to be specified: In the USB installer EFI that appears right after the OS installer is created with UniBeast? Or in the EFI after booting into the Clover screen installer that one sees before OS install has begun? Or is it placed in one of a few EFI folders one comes across after that initial OS install (assuming you don't get a prohib sign)? Or is it placed into System/Library/ or User/Library/ -I appreciate any and all specific paths that can be provided.
But I won't return to the Thunderbolt card-killing F7. I'm fresh out of spare Thunderbolt cards.
Hi
@jiffyslot.
"But I won't return to the Thunderbolt card-killing F7. I'm fresh out of spare Thunderbolt cards." 
I honestly think it was an issue when you updated using the Gigabyte BIOS utility within Windows that caused your issue, but I can understand your reluctance. F6, F7 work great for me, but I updated using the BIOS and the new BIOS file on a FAT32 formatted disk, without the thunderbolt card installed (I didn't have it at that stage).
This is what I do to get it all going, yes there are multiple ways to do this, but I'll keep it simple as I can.
Assuming you already have HS 10.13.6 installed on a drive as per this guide by
@Hackalot :
- Disable in the BIOS all of the drives, other than your HS drive (precautionary in case things go wrong and you delete something on wrong drive!)
- Make sure your BIOS is configured correctly to boot as per this guide.
- Remove TB3 and any other drives until you get it all going properly.
- Create a Unibeast 8.3.2 USB drive (UB) on a USB 2.0 Stick with HS 10.13.6 on your real Mac. Do not modify the config.plist on this Unibeast stick. The config.plist on this disk will be sufficient to boot your system.
- Once booted from your UB drive into HS, download and install Multibeast 10.4 (MB) from this site.
- Run MB with the following initial options only, to make your HS disk bootable with just the basics to get it going.
Quick Start - UEFI Boot Mode
Drivers - Network - AtherosE2200Ethernet v2.2.2 & IntelMausiEthernet v2.4.0
USB - USBInjectAll
BootLoaders - Clover UEFI Boot Mode (Our Mobo has NVRAM, so don't need 'Emulated NVRAM')
Build - Select the Install option.
- Hopefully! you will be able to reboot into the Clover menu and be able to boot into HS.
Once in HS:
- Install Clover Configurator (CC), available from here.
- Using CC to mount your hidden EFI partition, follow this:

- Finder should open and before copying my two config.plists, right click on the existing config.plist and select duplicate from the menu. This will create a copy of your initial config.plist that will be called 'config copy.plist'. You should keep this as you can tell the Clover boot menu to use different configs.plists in case you have a problem down the track. See below for my EFI folder.

- Copy over the two config.plist files into this directory EFI/EFI/Clover/ (my config.plist is setup to tell the system that it is a iMac 18,3. The config.original.plist is a copy of my original UB config.plist that identifies the system as a iMac 14,2
- Reboot
Note:
You can have
multiple configxxx.plists in this folder, but it will always default to the one named
config.plist. By having multiple config.plist files, Clover has an option where you can select which config.plist file to use to boot from. This is very handy if you stuff up a setting in the config.plist, as it will allow you to select another from the Clover boot 'Option' menu. Press F1 will give you Clover options. Here is how you can select different config.plist files.
- Hit the 'o' key to bring up the Options menu and then Select Configs...
- Then you can select any of the configs in you EFI/EFI/Clover folder
- Then keep on selecting the Return option until you are back at the main clover screen. Clover will then boot using this alternate config??? plist option and will revert back to the default config.plist option upon the next reboot. This will allow you to fix/change options in your default config.plist file using CC.
@MysticalOS replied to your post whilst I was typing all this, so depending where your understanding of all this is, both methods will/should work. I'm not 100% sure as to what state you HS disk is at, ie is it bootable from your UB boot disk?