![]() ![]() ![]() Click Restore and choose the DMG file as the source and the USB drive as the destination and hit Apply.Hit Apply to erase and partition the drive so it will boot properly.Click Options and choose GUID Partition Table.USB Users only (from here to end): Select the USB disk in the Disk Utility and choose the Partition tab and select 1 Partition from the drop down box and Mac OS Extended (Journaled) in Format type.Choose the disk as the startup option and install Mountain Lion. DVD Users only: Select Burn after selecting the DMG image file and then boot from the disk by restarting the Mac and then holding down the Option key as it books up.Insert either a blank double-layer DVD or an 8GB USB drive.Drag the installESD.dmg image file into the sidebar on the left of the Disk Utility app.Open the Disk Utility app in the Utilities folder under Applications.Find the InstallESD.dmg file inside the Contents > SharedSupport folder.Open the Application folder and find the installer app and right-click it to and choose Show package contents.Note that I’ve not tested this procedure since the first one works so much better, but it should work fine. ![]() DIY Method for Those Wanting to Avoid 3rd Party Software This should update any system with Mountain Lion.
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