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crwdns2934241:0crwdne2934241:0 John Lang

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I got the same warning regarding firmware upgrade, I think it refers to upgrading your already installed 5,1 firmware. I needed to re-start  5-6 times before the firmware actually installed. Once finished my Early 2009 Mac Pro is now running High Sierra.

A side note - I am using a Sonnet Technologies Tempo 6Gb/s SATA PCIe 2.0 Drive Card  with dual Samsung SSD drives, ORICO USB3.0 4 Port PCI Express to USB3.0 Host Controller Adapter and a AUKEY USB-C PCI Express Card. All of which help keep me up to date.

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open