A manager's task is to make the strengths of people effective and their weakness irrelevant - and that applies fully as much to the manager's boss as it applies to the manager's subordinates.
Never underrate the boss! The boss may look illiterate. He may look stupid. But there is no risk at all in overrating a boss. If you underrate him he will bitterly resent it or impute to you the deficiency in brains and knowledge you imputed to him.
Keep the boss aware. Bosses, after all, are held responsible by their own bosses for the performance of their subordinates. They must be able to say: "I know what Anne [or John] is trying to do.