May 2nd, 2021
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  1. First you need to copy Install macOS Big to the Applications folder. Further commands are executed in the Terminal, sequentially:
  2. Code:
  3. # Create a macOS Big Sur Virtual Disk Image
  4. hdiutil create -o /tmp/bigsur -size 16384m -volname bigsur -layout SPUD -fs HFS+J
  5. # Mount this Image to macOS
  6. hdiutil attach /tmp/bigsur.dmg -noverify -mountpoint /Volumes/bigsur
  7. # Use macOS Big Sur Createinstallmedia Tool to create a Installer Image
  8. sudo /Applications/Install\ macOS\ Big\ --volume /Volumes/bigsur --nointeraction
  9. # Unmount Volume Install macOS Beta
  10. hdiutil eject -force /Volumes/Install\ macOS\ Big\ Sur
  11. # Convert the bigsur.dmg to a bigsur.iso for Virtual Machine
  12. hdiutil convert /tmp/bigsur.dmg -format UDTO -o ~/Desktop/bigsur.cdr
  13. # Move and Rename bigsur Image to Desktop
  14. mv ~/Desktop/bigsur.cdr ~/Desktop/bigsur.iso
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