![]() I have working Macbook Air M1, i just need to downgrade or make clean installation with Big Sur.Įrase the internal macOS container, then install Big Sur and restore your system from your Time Machine backup at a point before the upgrade. ![]() If you still have issue on the fly you can Call Customer Support (800) MY–APPLE (800–692–7753) ![]() How to reinstall macOS from macOS Recovery. How to erase your Mac Erase and reinstall macOS - Apple Support If your machine shipped with macOS Monterey, you can not install/and run and older macOS. But when i selected to delete Volume group i got big warning which says: So i quit install and started Disk utility to delete Volume Group.
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