Final answer:
Pharaoh freed and restored his chief cupbearer to his former position on his birthday, according to the biblical story of Joseph found in the book of Genesis.
Step-by-step explanation:
The officer Pharaoh freed on his birthday and restored to his former position was his chief cupbearer. This event is recounted in the biblical story of Joseph, found in the book of Genesis. The Pharaoh had imprisoned both his baker and cupbearer but chose to free the cupbearer and restore him to his position, after he had interpreted their dreams. This account is not directly corroborated by Egyptian historical records but is a part of religious and biblical history.