I always forget how to do this, so I wrote some notes.
Check existing firmware on camera: Hold Disp/Back button and Switch Camera On
Go to fuji site and check if an update is required.
Erase Memory Card: Camera on > Menu OK > Left > down at the bottom
Download latest firmware on computer, put file on memory card via computer.
Battery full charged > put memory card in camera.
Hold Disp/Back button and Switch Camera On again.
Should see 'Firmware Upgrade' > OK > OK
WAIT!!! Don't do anything with camera whilst it's updating.
Should see loading and then confirmation when it's done.
Turn off, voila!
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