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To start from scratch, booting the 10.6 Snow Leopard Retail DVD directly, check out iBoot + MultiBeast.

This is a requirement, as you need access to the Mac App Store to download macOS and create the installation drive. In order to start fresh, you’ll need access to a functional computer running OS X Mountain Lion 10.8.5 or later. UniBeast is a tool that creates a bootable installer out of your downloaded version of macOS.

By doing this, you can always go back to your working installation. We strongly recommend performing a full backup of your existing system using Carbon Copy Cloner.