I have legacy system (ASUS Rampage III / i7 920 CPU) with a working Catalina System running and previously booted by Clover.
Since the last days I have switched to OpenCore and finally now I have a working legacy System booted by OpenCore.
Nearly everything is working but I can't upgrade to Big Sur.
In the System Software-Update Preferences I have downloaded the Big Sur Upgrade and have started the Upgrade Process.
After the first restart a new partition "macOS Installer" was found and this volume I had selected for continuing the upgrade Progress.
Sadly the upgrade ends to a "endless reboot without progress" and I don't know why....
What I have done so far:
1. Working Catalina with Upgrade Process startet
2. My used EFI: EFI.zip
Note: Folders Microsoft and Resources cleared due to upload file size limit...