I have a USB thumb drive that I have used to do a clean install of Mavericks with before. When I try to boot from it using the option key, I get the circle with a slash through it. Any ideas?
Probably not until 10.9.1 is released. The Haswell rMBPs are running custom builds of Mavericks and aren't supported by the general build available for download.
Probably not until 10.9.1 is released. The Haswell rMBPs are running custom builds of Mavericks and aren't supported by the general build available for download.