Fujifilm released firmware version 4.0 for their X-T3 camera. Here's an overview of the update, how to install, and some basic AF tests.
Get the firmware here: https://fujifilm-x.com/global/support/download/firmware/cameras/x-t3/
Fujifilm X-T3: https://geni.us/7WnKBv
Guide to new features: http://fujifilm-dsc.com/en/manual/x-t3/x-t3_nfg_omw_en_s_f.pdf