Updating firmware on macbook pro
Similarly, make certain that your original Mac hardware (or at least officially Apple supported hardware) is what is running inside the computer.
Apple had replaced my logic board but didn't install the newer firmware and so I could no longer boot off of my existing SSD drive (which was formatted with APFS, and had my original Mojave and all of my files). Boot off of Mojave on a USB, and plug in a new blank external hard drive, and install Mojave onto that.
Before performing the upgrade, make certain that you do not have any unnecessarily attached USB devices plugged in.
Attached peripherals can sometimes cause compatibility issues.
Once the machine is rebooted and you have logged in check the following: Now with your newly updated Mac Pro, you can go forth and peruse the sea of used Westmere Xeon CPUs on e Bay for procurement, or install the latest mac OS High Sierra.
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Users of recent 15-inch Mac Book Pro models need to install an updated version of mac OS that was just released this morning.