Step 3: Download 10.14.6 Combined installerįortunately, firmware flashing does not require updating in a particular order. The next step is pretty straight forward, boot into your install of macOS 10.13 if you haven't already. If you have no intention to upgrade to Mojave or already have it installed., don't worry. You can get old versions of macOS via the Mac using DosDude1's installer if you can't access it. (upside is you can buy a USB case and turn into a very fast USB 3.0 drive afterward or return it). Amazon and Newegg each have 120 GB SSDs for under $20 USD if you need a temporary drive to install macOS 10.13 on. You'll need a separate volume to boot into 10.13. Unfortunately, this is the biggest pain if you've already updated. If you encounter issues, try removing additional PCIe cards. Note: some users are reporting they had to remove all PCIe cards sans their storage controller (SATA card) and GPU to install the firmware update.
Mojave will not install if you have a non-metal supported GPU. Despite the annoyingness of having to meet the requirements, it was a necessary evil. Vulkan, the OpenGL successor, wasn't quite ready for primetime when Apple originally created Metal for iOS and thus decided to port it macOS. OpenGL has been a thorn in Apple's side for quite some time, as it's been nearly dead for years. The biggest change for macOS Mojave is the deprecation of OpenGL and OpenCL.
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