For some older Macs this won't necessarily be the latest OS, such as MacOS Monterey, but instead MacOS Catalina, for example. When the machine reboots, yank the USB Stick out. Run the Installer from there, targeting a USB stick with >5gb free space. Mount the invisible BaseSystem.dmg disk image. Your computer should then install the latest version of OS that it can install. So, heres how I got a Mountain Lion Install DVD from the recovery partition. Re-install MacOSX: click on " Reinstall Mac OS X" > "Continue".Select the Mac OS Extended (Journaled), give a name to your disk and click on Erase.Select the startup disk and go to the Erase Tab.
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Select " Disk Utility" and click on Continue. Creating a Lion or Mountain Lion installer usb using the new disk utility (tested on Mojave) Hi guys i have seen many people having prolems creating installers of those older mac os x versions which are not supported by the command line mthod, using the newer mac os x versions and the new disk utility, someone also said that its impossible.Turn your Mac on, while holding the CMD + R keys down.Also, it is advised to make a time machine back up of your computer if possible before following the procedure. I had to use Apples Lion Recovery Disk Assistant to create a copy of the Mountain Lion Recovery HD, so I could boot with it and wipe the entire HD. To reinstall your Mac's OS without an installation disc you need to firstly make sure that you keep your Mac turned on during the whole procedure, and that your Mac is connected to the internet. Since Mountain Lion is so much more stable for me than Lion, I wanted to get the DMG to make my own USB key for a Mountain Lion-only installation. sudo /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/.
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At some time I find this terminal script, but I cant find to make Mountain Lion USB. I try to use 'InstallDiskCreator', 'DiskMaker' and Disk Utility, without success.
HOW TO CREATE A MOUNTAIN LION INSTALL DISK HOW TO
In this article we will show you how to reinstall Mac OS without disc. Im using Mojave but I need to create a Bootable USB with Mountain Lion. MacOS includes a recovery partition that allows you to easily erase all data on your Mac and reinstall your OS without an installation disc.