The macOS operating system is a more stable system than Windows, but still sometimes, even this macOS needs to be installed from scratch. For example, you want to install new macOS beta, you have replaced your hard drive or want to install a different version, or you have updated to the latest version on top of the old one and now you are facing problems: the Wi-Fi network is unstable, constant problems with the programs — they slow down, crash, and so on. This may or may not be fixed with the next system update. Therefore, if you want macOS to work correctly and stably, you need to install it on a clean disk, completely deleting the old one.
Ok. How To Create a Bootable USB for macOSHere > you can download last version of new macOS
Step 1: Connect the USB Flash Drive that you’re using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
Step 2: Open Terminal, which is in the Utilities folder of your Applications folder.
Step 3: Type one following command in Terminal. These assume that the installer is still in your Applications folder, and newmacOS is the name of the USB flash drive you’re using. If it has a different name, replace newmacOS in these commands with the name of your volume.
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/newmacOS
sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/newmacOS
macOS High Sierra:
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/newmacOS
sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/newmacOS --applicationpath /Applications/Install macOS Sierra.app --nointeraction
OS X El Capitan:
sudo /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/newmacOS --applicationpath /Applications/Install OS X El Capitan.app --nointeraction
Step 4: Press Enter and enter our account password, to start creating a bootable flash drive, press Y on the keyboard, then the copying process will begin
After 10-15 minutes the bootable flash drive from Mac OS will be ready for use. When Terminal says that it’s done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.
In a few minutes, your bootable flash drive will be ready, but remember that the created USB flash drive is intended only for installing the system on Mac computers
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