![]() Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/Catalina -nointeractionīless -folder "/Volumes/Install macOS Catalina/System/Library/CoreServices" -bootefi ~/Desktop/boot.efi Hdiutil attach /tmp/Catalina.dmg -noverify -mountpoint /Volumes/Catalina Hdiutil create -o /tmp/Catalina -size 8050m -volname Catalina -layout SPUD -fs HFS+J You can download Catalina 10.15.1 boot.efi hereĬopy downloaded boot.efi to your Desktop. Step 2: Create a modified ISO installer changing boot.efi for Catalina 10.15.1 boot.efi. Step 1: Download Catalina 10.15.2 or Catalina 10.15.3 with a Mac. Boot.efi-macOS-X-Catalina-10.15.1 boot.efi working in VirtualBox with macOS Catalina Original boot.efi from "Install macOS Catalina" (10.15.1), works in VirtualBox and can fix VirtualBox boot issue in later versions of Catalina.
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