The firmware update Ver.2.10 from Ver.2.01 incorporates the following issues:
Camera performance used with the XF50mmF1.0 R WR is optimized.
The phenomenon is fixed that in a multiple-flash shooting where the EF-X500 is used as a commander, flashes in some groups sometimes don’t fire correctly. Also in case the EF-X500 is used as a commander and the EF-60 as a remote flash, upgrade the camera firmware to the latest version.