I can lock auto exposure but the compensation dial is disabled so I can't lock exposure and tweak it. Also when AE is locked, the viewfinder doesn't show the selected exposure value but continues to compensate as I move the viewfinder do different parts of the scene. I can't immediately delete a just shot photo that is being displayed on the rear screen. I have to go back to the shooting mode and then back to the review mode to delete it. Where do I find my firmware version?