There is also the even trickier business of installing a clean copy of an older version of macOS on your Mac (Monterey, Big Sur, Catalina, High Sierra, Sierra, El Capitan, Mojave, Yosemite or an even old version of OS X). Not only are there three different methods (which we’ll run through below) the methods depend on the version of macOS that you are running. Use the Erase All Content and Settings option setting in System Preferences (available if you are running macOS Monterey and later on a M1 or M2 Mac, or an Intel Mac with a T2 chip).Use macOS Recovery to reinstall macOS via the web.Make a copy of the macOS installer on a USB stick, reformat your drive and then install the macOS on to your Mac from the installer.If you are happy to take the risk and still want to wipe your Mac and reinstall macOS – which you should definitely do if you are selling or passing on your Mac – read on! Three ways to clean install macOSĪs we explained above, there is more than one way to wipe your Mac and reinstall macOS: Again, the seal guarantees that everything is fine and that nothing untoward has crept in. All components are checked after installation, then signed and finally the entire system is sealed again. As long as your Mac works (which can be determined on the basis of the seal), the Mac is considered to be in working order as it complies with Apple’s specifications.įor that reason, even if you do encounter problems on Macs with T2 chip or Apple Silicon while running macOS it makes no sense to reinstall the system yourself.įor those who want to do a clean install so that no leftovers that belong to an old system are carried along, this no longer applies because none of this information is carried over. However, if your Mac boots up without issue then it indicates that there are no problems with the system. Should this happen you will have to reinstall the system. Should a problem occur with macOS during a restart, perhaps because a storage space on the SSD is defective and thus a system component is no longer intact, this will be recognized by the startup process since the seal will now be invalid. You can use this file to create a bootable USB stick or install macOS Mojave on virtualization servers like VMWare or VirtualBox.Īlso, clean up the temporary virtual disk image to save spaces if needed.Ĭredits go to author of this post on Reddit.So macOS itself cannot be changed by any software that you install as a user. Okay, after this you have the file ~/Downloads/Mojave.iso. Step 6: Change file extension to ISO mv ~/Downloads/Mojave.cdr ~/Downloads/Mojave.iso Step 5: Save DMG info ISO format hdiutil convert /tmp/Mojave.dmg -format UDTO -o ~/Downloads/MojaveĪfter this command, you will see this file ~/Downloads/Mojave.cdr. Step 4: Unmount the installer appĪfter executing command at step 3, it will automatically mount the app file, so now you need to eject it for step 5 below. Make sure to use correct path and execute command with sudo like above. The createinstallmedia is the tool packed into the Install macOS Mojave.app file that we’ve downloaded from all above. Step 3: Write the installer into mount point sudo /Downloads/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/install_build The virtual disk image is attached to mount into /Volumes/install_build. Step 2: Mount the disk hdiutil attach /tmp/Mojave.dmg -noverify -mountpoint /Volumes/install_build It will create a virtual disk image at tmp/Mojave. Step 1: Create a virtual disk for installation media (DMG file) hdiutil create -o /tmp/Mojave -size 8000m -layout SPUD -fs HFS+J This part requires you know how to execute commands from Terminal. Make sure to follow the instructions on that page to get the final macOS Mojave Installer.app file, putting it somewhere, for example: ~/Downloads/Install macOS Mojave.app 2. You don’t need to do that manually, some guys has created a tool for us to work on this automatically.ĭownload this macOS Mojave Installer Patch Tool.
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