Hi all,
Anyone else have this same problem?
I have created a macOS Big Sur USB installer.
I boot into a Macbook (2017 or 2018 model) recovery partition, which would come up as either Mojave or Catalina recovery partition.
When I type in
"/Volumes/Install macOS Big Sur/Install macOS Big Sur.app/Contents/Resources/startosinstall" --agreetolicense --installpackage <microsoft office> --volume /Volumes/Macintosh HD
This doesn't work because the older recovery partitions don't allow macOS Big Sur.
I tried Opt+Cmd+R to try to download the latest recovery partition. Only then can I successfully install macOS Big Sur.
But Opt+Cmd+R doesn't always work.
I would like a method that works 100% of the time, even if it takes a bit longer to execute.