Do not attempt to install a BIOS for the standard XPS 13 (9343, 9350, 9360, 9370). The 9365 has an entirely different motherboard and Intel Y-series chipset. Using the wrong BIOS will brick your machine permanently.
Updating the BIOS on your Dell XPS 13 9365 2-in-1 Go to product viewer dialog for this item. Dell Xps 13 9365 Bios Update