FUJI GFX 100s 2.12 firmware update problem

[Jose Basbus]

I purchased a GFX 100s at B&H in New York City on August 2021.

I have installed recently the latest firmware version (2.12) and I encountered that the front wheel has stopped working.

I use my camera always in mode "M", using both the front and back wheel to change aperture & shutter speed. I have noticed that the front wheel has stopped changing any value: "aperture", "s.s." and/or "ISO" (no matter each of which is selected on the menu). In addition, the aperture is not changed despite the GF lens is set the aperture ring to "C" and/or "A". 
The front wheel does not work no matter I select "M", "A" or any other shooting modes. Only the aperture is changed by the back wheel on "P" mode.

 Is there any chance to downgrade the firmware version to 2.11, so that to see if the front wheel comes back to work properly, or any other option available?.

Any piece of advise would be much appreciated.