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Select the Mac OS Extended (Journaled) in the Format select list.Select the USB flash disk, click the Erase button to format it, give it a name for example Vol1.Open the Finder -> Applications -> Utilities -> Disk Utility.Connect the USB flash disk to your mac computer.app file in it to the Finder -> Applications folder. Open The downloaded dmg file and move the.If the installation program automatically runs, press Command + Q to exit the installation program.

After the download is complete, do not start the installation.Then you can download it to your local MacBook.Open App Store and search the keyword macOS Big Sur in the search box.Ensure that the USB flash drive does not contain important data because it will be formatted during the process and all the data in it will be erased.USB disk space should be bigger than 16G.Before you can create a macOS boot USB flash disk, you must have a USB flash disk.
