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I’ve upgraded. Few important things.
1) It must be latest EFI 1.4 on Mac Pro 4.1. Was 1.3. Have to upgrade first.
2) Literaly no cards (PCI) and devices other than Apple common. USB 3.0 card from Unitek forced upgrade to fail. Unmounted, no problem.
3) After procedure have to reset PRAM (cmd+alt+P+R on restart). Without this 1333 MHz RAM modules are recognized as 1066 MHz
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