Once the USB drive has booted, select Disk Utility from the Utilities window, choose your Mac's startup drive from the list, and click Erase.Use the mouse pointer or the arrow keys on your keyboard to select the disk called Install macOS Catalina in the drive list that appears on the screen.To do so, restart your Mac and hold down the Option (⌥) key as soon as you hear the reboot tone. You can install Catalina on your Mac as soon as the USB installer has been created. This will take a few minutes to complete, so leave it running until you see the message "Install media now available." Note that if you're asked whether you want to install Xcode during the process, you can safely click Not Now and the process will complete successfully regardless. Type Y and press Enter when prompted, and the command will create your bootable Catalina installer on the USB drive.Enter your administrator password when prompted.Once you've replaced XXXXX in the last step with the name of the USB drive, press the Enter key on your keyboard to run the completed Terminal command.Still in the Terminal window, type /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/XXXXX but replace XXXXX with the name of the USB drive you intend to use as a bootable installer.Drag the createinstallmedia file into the Terminal window.Navigate to Contents -> Resources within the installer package.Next, open a Finder window, navigate to your Applications folder, right-click (or Ctrl-click) on the macOS 10.15 installer, and select Show Package Contents from the contextual dropdown menu.At the Terminal command prompt, type sudo followed by a space.Launch the Terminal app (found in Applications/Utilities/Terminal).
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