Fujifilm has released new firmware updates for GFX 50S and GFX 50R. You can take a look at firmware details and download links.
Fujifilm GFX 50S
Fujifilm Released Firmware for GFX100(Ver.2.0), GFX 50S(Ver.4.0), GFX 50R(Ver.2.0)
Along with new GF 30mm f/3.5 R WR Lens, Fujifilm today released biggest firmware upgrade in the history for GFX system (GFX100 Firmware Ver.2.0, GFX 50S Firmware Ver.4.0, GFX 50R Firmware Ver.2.0). You can see the full press release below: