Minix x7 mini WiFi problem

I own a x7 mini that I used for years with wired Ethernet.
Yesterday I tried to connect with WiFi with no success.
I switch ON the WiFi, the Minix goes into ".... scanning...." forever and does not display anything at all.
It does not find any networks, even if more than one are available.
Nothing at all.
If I switch on the hotspot... it become visible, so I suppose that WiFi should run.
I performed a complete RESET to factory.
Still the same problem.

Any idea?