Back on Page 2 of this thread, there is a posting for NGC 896, the Fishhead Nebula, 'Ol Fishhead juts off from the beautiful Heart Nebula, IC 1805. On the other side of the Heart is IC 1831 (also attached to the Heart Nebula). IC 1831 is a faint Diffuse Nebula in Cassiopeia's Constellation. The brighter nebulas get more attention, but IC1831 has its own merits.
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This is the exposure equivalent of 80 minutes, 25 seconds. The nebula in the lower right hand side is the Soul Nebula, IC 1848.
Heart Nebula: https://apod.nasa.gov/apod/ap190911.html
Soul Nebula: https://apod.nasa.gov/apod/ap160228.html
Assuming the in-camera conversion from raw to jpeg works, it sounds like the software was updated before the firmware.
It might be time to contact the Fujifilm offices in your region (lookup Fujifilm contact in your search engine) and see if they know more information.
I tried Raw File Converter, Capture One, MacOS Photos.App, Adobe Bridge. All of them can open and convert raw files. There's one huge difference: these apps do the conversion themselves and do not use the camera. While X Raw Studio uses the camera to do the conversion.