Lion to Snow Leopard Problems
Ever since downgrading from Lion to Snow Leopard I have started experiencing problems concerning the EFI Firmware on my Early 2011 Macbook Pro. The startup bong is uncontrollable, blue screen when switching graphics cards and a change in resolution when logging out.
So I ask... Does upgrading Snow Leopard to Lion also upgrade or change the macbook pro's firmware?
MacBook Pro, Mac OS X (10.6.8), Early 2011 model.