Editing this post since I got it working:
I just installed Big Sur successfully (so far) from scratch by hopping between guides in this thread. In case anybody needs to hear it, here's the steps I did. This is using a Big Sur 11.5 installer. 11.6 Probably works too.
- Format a flash drive (I used a 32 GB 3.1. The times I tried with a 16 GB 2.0 did NOT work)
- show all devices, select parent drive
- Big-Sur, macOS extended (journaled), GUID Partition map
- sudo Applications/Install\ macOS\Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/Big-Sur
- Download opencore configurator 0.7.6, set settings to "OC 0.7.6 Release Version"
- Download OC-076-DESIGNAIRE-Z390 (from this post), unzip, rename folder to 'EFI'
- mount EFI partition on my Big-Sur flash drive with EFI Mounter v3, move newly renamed 'EFI' folder to the EFI partition at top most level
- rename 'config-Intel-iGPU.plist' to 'config.plist'
- open 'config.plist' in opencore configurator 0.7.6
- using this image for reference, open hackintool 3.7.5 and copy over 'serial number', 'system ID', 'ROM', and 'board serial number' to the 'PlatformInfo --> DataHub' section.
**** this image also says to enter the 'system product name' such as iMac19,1. I have no clue what I'm supposed to choose here, I just went with iMac19,1. I believe my last mojave install i used something like iMac1,1, not sure. How am I supposed to figure this out?
- save, close
- updated designaire BIOS to F9g. The guide post linked to a beta version of F9g that was uploaded to this thread, but using that file to update my BIOS, the BIOS would always read that it was still on F8. I downloaded F9G from the gigabyte website and updated successfully using that.
- Edited BIOS using the spoiler on post 1 "version f8 or newer"
- Tweaker
- Advanced CPU Settings → Enabled
- Extreme Memory Profile (X.M.P.) → Profile 1
- Settings
- Internal Graphics → Enabled
- Above 4G Decoding → Enabled
- Thunderbolt(TM) Configuration
- Security Level → No Security
- Discrete Thunderbolt(TM) Configuration
- Thunderbolt USB Support → Enabled
- GPIO3 Force Pwr → Enabled
- USB Configuration
- Boot
- Windows 8/10 Features → Other OS
- CSM Support → Disabled
- Boot → CFG-Lock → Disabled
- The guide says "Save & Exit → Save Profiles → Save to Profile 1", this was not an option for me. Save and Exit just has a yes/no confirmation, which I chose yes.
- Shut down PC and DISCONNECT ETHERNET CABLE
- Booted with F12 to get to OpenCore, chose Install macOS Big Sur.
- Open Terminal and change the date to 08/15/2021. 'date 0815111121'
- this is just because i used 11.5. Choose a date shortly after the date whatever version you're using was released. A few times I disconnected my ethernet while I was already booted just before entering the date command and it did not work.
- Chose Disk utility and formatted my NVME drive
- Name: Big Sur
- Format: APFS
- Scheme: GUID Partition Map
- Chose Install macOS Big Sur.
- PC rebooted 4 times, each time I chose either "install macOS Big Sur" or "Big Sur" after the 2nd reboot.
- Once Big Sur booted, copied the EFI from the USB drive onto the EFI of the Big Sur Drive. I used EFI Agent this time.
This process failed for me a few times at the "this installer is damaged" part. I went from a 16GB 2.0 flash drive, macos 11.6, and disconnecting my ethernet just before entering the date command, to a 32GB 3.1 flash drive, 11.5, and disconnecting before I even booted for the install process. Not sure which piece there is the key.
Hope this helps someone! Also let me know if I'm missing something important, or what I should be choosing for the System Product Name. I'm not sure how to figure that out or if it matters!
