Sony has released firmware update 1.10 for the Sony A9. It’s currently available on the Sony Australia Support website. [UPDATE (9/28/17): Firmware update is now posted on the Sony USA Support website.]
Improvements in Sony a9 Firmware Update FW 1.10:
• Supports ‘Eye AF’ function for A-mount lenses via the LA-EA3 mount adapter (This function is only for A-mount lenses which can adapt to 8 or 10 fps (maximum) tracking AF-C shooting.
• Fixes an issue where RAW files may disappear when SDXC or microSDXC memory cards are used in certain smartphones (Raw data recorded by the ILCE-9 with firmware Ver. 1.00 or 1.01 could disappear. Please backup your raw data files, even if you’re updating the system software to Ver. 1.10.)
• Improves the image quality and overall stability of the camera.
[Please Note: “improves image quality” refers to in-camera Noise Reduction and Jpeg rendering]