Or use the OS X installation disc that came with your machine or buy a new one to. Download the relevant macOS or OS X installer from Apple, then use Terminal to create a USB installer you can boot up from. If your current OS installation is still functioning, you should be able to get there. Install macOS or OS X from Internet Recovery Mode, which you can boot into by holding option+command+R while your Mac powers up. Otherwise, make sure that Enable Boot from USB devices is On under Advanced options of the UEFI Boot configuration screen. On the Choose an option screen, select Use a device > USB Storage. Under Advanced startup, select Restart Now. Choose the Macintosh HD you named earlier. Advertisement You’ll be asked which hard drive you want to install to.
If you booted from a USB disk, click Continue to advance to the installer.
#HOW TO INSTALL OS X OFF BOOTABLE USB UPDATE#
If the USB stick is not listed it is probably not set up correctly, there are some specific steps to make a bootable install disk Copy the file off the USB drive. To do this: Insert the USB drive into the USB port, and then select Start > Settings > Update & security > Recovery. If you booted from a functioning recovery partition, click the Reinstall macOS button. You should see a screen to select the disk to boot from. Next, you’re going to head on over to the Mac App Store on a Mac laptop or computer. Try booting the Mac from the USB stick Reboot the Mac with the USB stick connected hold alt during startup. Now, click on the “Erase” button and the Disk Utility will prepare the USB stick for the next steps you’re going to follow.ĭisk Utility will let you know when it’s completed the task once it’s finished, close Disk Utility.Leave the USB stick named as “Untitled.” Make the format “Mac OS extended (Journaled)” and use “GUID Partition Map” as your scheme.Click on your USB stick, then select “Erase.”.Once you open Disk Utility, you’ll see your USB drive listed. You’ll have to prepare it by going to Applications > Utilities > Disk Utility. Make sure you have what you need from it, because you’re going to erase it and make it Mac compatible. Before you do anything with the USB stick, it must be 8GB in size or larger.
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