When the system reboots and finishes installation, it will boot from the external HD. Download High Sierra Beta and install it in the external hard drive. From 10.11 or 10.12 systems, format an external hard drive with at least 500gb with 'Mac Os Extended Journaled'. If you don’t create a bootable drive for macOS High Sierra, you’ll have to install an older Mac operating system first and then upgrade to macOS High Sierra afterward. Clean Install High Sierra on APFS-formatted main HD Installation Steps. An instant solution to remove forgotten Mac EFI firmware password. “You’ll need a copy of macOS High Sierra to perform a clean install later on. If you do, youll have to erase your files and reinstall macOS to regain use of your. “Before you erase your current operating system, download macOS High Sierra from the Mac App Store,” Filipowicz and Gil write. If you don’t save these important files off your computer, you will lose them.” To save your files, put them on an external hard drive or a cloud-based program like Dropbox, OneDrive, or iCloud. After several changes and improvements spread out over many beta releases, the final build of macOS High Sierra is ready for public consumption.
HOW TO DO A CLEAN INSTALL OF MAC OS SIERRA HOW TO
“That means any files, programs, or documents you have will be deleted. Here’s a step by step tutorial on how to clean install macOS High Sierra 10.13 on your Mac the easy and the right way. “This process will erase whichever OS you’re currently using from your hard drive entirely,” Filipowicz and Gil write. “If you feel like you’d like a fresh start with macOS High Sierra, you can always opt to do a clean install.” “Downloading and installing a new OS gives you the opportunity to do some major house cleaning if you so desire,” Luke Filipowicz and Lory Gil write for iMore.