No, a 300 Series board does not need the 2000 Series update for the Ryzen 5 1600AF.
No, a 300 Series board does not need the 2000 Series update for the Ryzen 5 1600AF.
If it's available, confirm with the seller that the bios are fully current and functioning properly. It should be in good condition. They're getting these new units. You're unsure about what might be stored there.