Download the tool, but when running it, select the 'download ISO' option - don't look to create the bootable USB within the tool itself. When it’s done, insert your USB drive into any Mac, then launch the installer by holding down the Option key when you boot up your computer. Yes, you just have to split up the process.Let the command line do its work and don’t interrupt it until you see the final line that says "Done".If it doesnt show up, click Apple icon and select 'Sleep'. Plug the USB which is not showing up to your Mac computer. Press Command+Option+Esc keys to close all applications that are not responding. Type in your password when prompted and press Enter. Restart Mac computer, press the Command +Option+P+R keys until the Apple logo appears.Sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ macOS\ Sierra.app -nointeraction &say Done Type (or copy and paste) this command into Terminal, replacing Untitled with the name of your drive, then press Enter:.Open up Terminal (Applications > Utilities).It’s best to disconnect any other external hard drives or flash drives so you don’t mix them up. Before you do so, back up any important data on that drive. If it isn’t, open up Disk Utility and format is so it is. Make sure the drive is formatted for OS X Extended (Journaled). For this tutorial, we’ll use the name Untitled. Insert an 8GB (or larger) flash drive and give it a name.Download the OSX installer macOS Sierra (in this example which is in Applications folder).If you don’t want to download an extra bit of software, you can make your own installer USB drive using Terminal.
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