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@klouds1292 Thank you for respond. I also try with "busratio=20", "cpus=1", "GraphicsEnabler=No", "PCIRootUID=1" (PCIRootUID or PCIrootID ???), ... When boot from usb, i saw the apple logo, it stoped here. Do you have the same model with me? Is it work? Please give me detail! Thanks you!