X-T3 firmware v3.20

The firmware update Ver.3.20 from Ver.3.10 incorporates the following: Enhanced autofocus. *Improving the tracking performance of the eye AF frame, making it easier to attain accurate autofocus on the eyes. *Improving face-detection performance when there are faces of different sizes within the same frame, making it easier to attain accurate autofocus. *Improving autofocus capability on a foreground subject even when there is a mixture of foreground and background subjects within a AF frame, causing the foreground subject to go out of focus, e.g. when shooting flowers against a busy background. Capability to save up to 9,999 pictures in each folder. Until now, the number of pictures that can be saved in a folder on an SD card was limited to 999. This update will raise the limit by ten times to 9,999 pictures. The phenomena below during a movie shooting are fixed. *Focus hunting at the minimum aperture. *A black line can sometimes appear on the bottom of the center. Fix of minor bugs.