I'm building a Big Sur installer to test. Are the Big Sur experimental patches (are they still considered such?) backwards compatible with Catalina? I'm not quite ready to upgrade but would like to prepare the groundwork. edit I might be overlooking something obvious, but I created the installer by downloading Big Sur Final from the App Store, formatting a big enough usb stick then use the
Code:
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/BigSurInst
command to write it (succesfully). However, it only contains one single partition, no EFI it seems. Will try making it again, but it completed with no errors first time around.
EDIT
D'oh. An easily overlooked mistake: don't format the usb drive with the (default) Master Boot Record but set it to GUID.