Nikon has just released the latest firmware version 1.13 for D750 on June 09, 2018. This update is just only cosmetics by displaying the “Time zone” with the world map and the name of major cities. Selecting your city or other cities which are situated in the same time zone. After updating, the new time zone looks like the one in the picture below:
Whether you update this new version from version 1.12 or not, it doesn’t make any difference to the camera’s performance. But as a user of Nikon and Olympus I find that updating Nikon’s firmware (via memory card) is much easier than that of Olympus.The link for Nikon’s firmware update is here.