Please install 10.12 Sierra Updates (Folders of Content) mac will restart… then go to the Apple Logo / About this Mac / System Report… then go to BOOT Rom Version, it should say something like: 483.0.0.0.0 If it’s NOT the case please send us a message. if the number looks like: 483.0.0.0.0 (or similar) then… Continue reading Update Firmware on older Macs