Sometimes your MacBook Pro requires to be booted from an external hard drive instead of a primary start up drive.The built in Recovery HD partion has a bootable recovery disk already on it, but we need to get the computer to download the. This means the installer downloaded from the Mac App Store or from a friend's computer will not work. The MacBook Pro Retina 2013 uses a special build of OS X 10.9.1.Apple messed up on the OS installer images certificates so your old image may not work! How to create a bootable macOS Sierra installer drive. So you’ll need to either download and setup a bootable Sierra OS installer or using Disk Utility wipe your drive down and setup with GUID - APFS Also make sure you delete all of the volumes on your drive.Once the computer is in Target Disk Mode and available as an external volume to the host Mac, you can copy files to or from that volume. To enter Target Disk Mode, turn on your Mac and hold down the T key immediately upon hearing the startup chime. Target Disk Mode allows a Mac to be used as an external hard disk connected to another Mac.Open App Store and locate the full installer download file (5.29 GBs) for 10.9.1.
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