Hi Etienne,
I "just for fun" opened the V1.13 Firmware update file (.PRG) with the "7-zip" archive program. Here you can see that, among other things, all internal contents (e.g. Voices, Styles, etc.) were saved again in September 2022. Unfortunately, I did not find any detailed information about the actual changes within the update file, although many ReadMe and Log Text files are included.
Best regards,
Chris