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My system specs (also in signature): GA-H55M-USB3 rev. 1.0 | i5 760 | Sapphire Radeon R7 240 Motherboard is NOT UEFI. Actually I've installed Yosemite 10.10.5 on a SATA HDD (NO SSD) without major issues. SATA controller is an Intel 5 series in AHCI mode. I'm trying to update to High Sierra...