![]() ![]() ![]() If you have ever installed that version on your Mac, no matter what version (or no version) is currently installed, you have these options. For example, if a Mac shipped with MacOS Mojave but is currently running MacOS Catalina, using Internet Recovery to reinstall MacOS on that machine will. Set the format type to Mac OS Extended (Journaled. However, you have other keystroke options depending on which version was previously installed.Īpple changed the start keys with macOS Sierra version 10.12.4. Click on the Options button, set the partition scheme to GUID then click on the OK button. If your system boots to the recovery tools, then the. ![]() (If your main macOS partition had system files become damaged or missing, your other files will remain intact, as this reinstallation only installs and replaces system files and apps.)Ĭommand-R should reinstall the latest version of macOS that you had previously installed on this computer. To see if your system contains a Recovery HD partition, you can restart with the Command-R keys held down. When complete, it should reinstall macOS Recovery and reinstall macOS on the main partition. You should then be prompted to connect to a Wi-Fi network, and you enter a password.Īt this point, the Mac should start to download the recovery files from the internet and show a status bar. Example with the terminal: gksudo gedit /etc/grub. The Mac should recognize that there’s no macOS Recovery partition installed, show a spinning globe. Make sure, that the following command lists a /boot/efi partition: cat /etc/fstab If /boot/efi is not present, you will not be able to boot into Mac OS X, if it exists you have to add the menu entry in grub like this: Open the file /etc/grub.d/40custom with your favorite text editor as root. Command-Shift-Option-R: Reinstall the version of. Startup Manager/Boot From USB: Option Safe Mode: Shift Apple Hardware Test/Apple Diagnostics: D Reset PRAM/NVRAM: Cmd + Option + P + R Reset SMC: Shift +. Start up your Mac from a shut down state or restart it, then immediately hold down Command-R. Command-Option-R: Upgrade to the latest version of macOS that works on your Mac, which may not be the very latest release of macOS for older Macs. ![]()
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