POINT: You can't write without symbols (code), and, by definition, those symbols would constitute the first alphabet.
Pictographs or cuneform are not an alphabet. You don’t have an alphabet until glyphs are seen as sounds or phonics in a distinct reproduce-able manner.
I hope everyone realizes that as recently as the 1950s we were still of the impression that the Bible was derived from oral tradition ~ and whole libraries of books were written attacking the Bible as a fable.
The Sumerian texts had been discovered, in part, a number of years before but none of that sunk in until good translations were produced. Then, all at once the Bible didn't look at all that ancient~ kind of a "newcomer" in fact.
The tablets at Ebla were discovered, translated, and names like those of ancient Hebrews began popping up.
Genesis still contains basic instructions for creating a Memory Palace if you wish ~ think of an Ark ~ lots of cages, many levels, a handful of people each with different skill levels ~ that's the first one. Then, there are the genealogies of the prophets, et al ~ very similar to the lists of French Kings that you can use to help you organize historic timelines for your readings.
I think it just now occurred to me why the full set of instructions for using the Memory Palaces wasn't provided ~ e.g. the one for the Garden of Eden was really truncated ~ down to one plant and one critter for example!
It would be contact with writing, and lo and behold, Abram was known to have visited places where Sumerian writing was known and taught. Once you had writing, the discussions of Memory Palaces became less important.