Nephi could read and write Egyptian.
1 Nephi 1: 1-2
1- I, NEPHI, having been born of goodly parents, therefore I was taught somewhat in all the learning of my father, and having seen many afflictions in the course of my days, nevertheless, having been highly favored of the Lord in all my days, yea, having had a great knowledge of the goodness and the mysteries of God, therefore I make a record of my proceedings in my days.
2- Yea, I make a record in the language of my father, which consists of the learning of the Jews and the language of the Egyptians.
Nephi was taught by his father, Lehi, to read and write Egyptian and his descendents could do the same.
Mosiah 1: 4
"For it were not possible that our father, Lehi, could have remembered all these things, to have taught them to his children, except it were for the help of these plates, for he having been taught in the language of the Egyptians therefore he could read these engravings, and teach them to his children, that thereby they could teach them to their children, and so fulfilling the commandments of God, even down to this present tiem."