
Fujifilm has released the new firmware for the Fujifilm GFX50SII, which fixes the bug with the exposure compensation button.
The Fujifilm GFX100S suffers the same issue after the latest firmware, but so far it has not yet received the bug fix firmware. Fujifilm writes:
Revised firmware for FUJIFILM GFX100S is still being evaluated, although it was planned to be released on May 31.
We will release the revised version A.S.A.P. We apologize for the inconvenience and appreciate your patience.
In the meantime, here is the workaround (which some might even prefer).
Firmware Details