Eventually I have updated , more than painful, the STEVAL-MKI109V3 (DFU) and now the FW rev = V3.42.4 is installed. I can see the correct rev on UNICO GUI and everything works fine.My point: I don't understand why downloading the last rev of UNICO GU...
I uploaded from https://www.st.com/content/st_com/en/products/development-tools/software-development-tools/sensor-software-development-tools/unico-gui.html#overview