![]() Find the installer in your Applications folder and right-click on it then. RELATED: How to Update Your Mac and Keep Apps Up to Date How to Erase Your Mac and Reinstall macOS Quicklyīefore you begin, make sure you have backed up your Mac using Time Machine or another backup solution of your choice. Download Lion from the Mac App Storebut dont install it yet, because of the disappearing installer issue noted above. My hard drive was cluttered with a load of crap I didn't want, so I wanted to start again. ![]() You’ll also need to update your Mac to macOS Monterey or newer. How to Do a Clean Install of OS X Lion, From Lion: You're probably in a similar situation as me. If you have an Intel Mac you can click on “System Report” followed by “Controller” or “Bridge” to see if there’s a T2 chip inside. ![]() You can find out which Mac you have by clicking on the Apple logo in the top-left corner and clicking “About This Mac”. ![]() The feature is limited to most Mac computers released after 2017 which contain the T2 security chip, and newer machines that use ARM-based Apple Silicon chips like the M1, M1 Pro, and M1 Max. ![]()
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