These instructions will also work for Mac OS X 10.9 Mavericks (excluding a Yosemite-specific step) and differ significantly from the instructions for creating a Mac OS X 10.6 Snow Leopard installer. In this post, I will go over instructions on how to create a bootable USB flash drive containing the Mac OS X 10.10 Yosemite installer. I followed the instructions below to successfully create a bootable installer for Mac OS X 10.11 El Capitan, which is the last version to support the 2008 Core 2 Duo Macbook Pro. I needed to upgrade my sister’s 2008 Macbook Pro and found that the existing Mac OS X 10.6 Snow Leopard did not support the “createinstallmedia” tool I got a “Failed to start erase of disk due to error (-9999, 0)” error. Update 2: The instructions below will work to manually create a Mac OS X 10.11 El Capitan USB installation drive. Update: Go to Install macOS Sierra Using Bootable USB Flash Drive if you want to install macOS 10.12 Sierra instead. Download the Yosemite installer from the Mac App Store and make sure it’s in your main Applications folder (/Applications)-it’s called Install OS X Yosemite.app. Download create-bootable-installer-for-os-x-el-capitan.sh to the USB drive Boot into Recovery Mode Insert the USB drive. How to create a bootable OS X Yosemite drive! You can perform clean installations easily and install this version of OS X on other Macs! Sudo Command: sudo /.
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