So is mine but the Fuji update site lists the new FW as v4.31 and v3.20 but the 'update' is the same as the existing FW.
Edit: All sorted, seems I had the previous version of the FW lurking on the computer and as the updates use the same file name it was the old file that was copied onto the sd card.
Note to self, tidy up old FW after use!