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You can cancel out of the actual installation when prompted. You may want to test the USB Flash Drive to make sure the installer works properly. When the process completes, close Terminal. Terminal will display progress indicators along the way. The USB Flash Drive will be formatted then macOS Big Sur will be copied onto the drive. When prompted, press “Y” to proceed with formatting the USB Flash Drive. You will need to enter your computer Admin password to proceed. Important Note: If you did not name your USB Flash Drive “MyVolume” then replace “MyVolume” in the Terminal command with the name of your USB Flash Drive. Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume

Copy and paste the following command into the Terminal window then press Return/Enter: In the Finder, select Go then Utilities then launch Terminal. If the macOS Big Sur installer launches after download, simply close out of the installer. Don’t move the installer file as the Terminal command will reference this file in this specific location. The installer should be saved to the Applications folder. Next, download macOS Big Sur (refer to How to get old versions of macOS for download link). Keep in mind all data on the USB Flash Drive will be erased so don’t use one with data that you want to keep. Apple suggests at least 14GB of available storage so get a USB Flash Drive with at least 16GB of storage. To create a macOS Big Sur bootable USB installer, you will need a USB Flash Drive.