Nikon released new firmware version 1.20 for the Nikon D5. The new firmware added two new AF-area modes. Updated the photo info display to show the color temperature for photos taken with Auto selected for white balance. The higher the amount of Active D Lighting selected when optional flash units were used with auto aperture (AA), non-TTL auto (A), or distance-priority manual (GN) flash mode, the more the resulting images would be underexposed.
Download: Firmware version 1.20