2009 Mac Pro, Firmware flash to 2010 firmware!
In order to move past Sierra 10.12.4, (which should have been impossible to install), we must flash the machine to the 2010, 5,1 firmware. This video details that process.
Many thinks to Jay, at House of Moth, for his very well written and clear directions.
https://thehouseofmoth.com/turning-a-...
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