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tallest skil said: For the love of… I have to clean install 10.10 or earlier now. I didn’t turn off SIP before applying the firmware upgrade, so now it will always refuse to apply it until an OS without SIP is in play. I think I’ll just dea…
Tallest, you mentioned unsupported 2009 Mac Pro. Would upgrading the firmware to 5,1 help resolve the issue?