USB type-C port not working

Today SupportAssist updated my system and after the reboot my USB Type-C port didn't work anymore.

It was connected to an external monitor, but I tried to connect also with a USB memory stick and nothing happens. Instead the normal USB port is still working.

These are the updates that have been done:

- Dell Inspiron 7391/7591/7791 System BIOS - 1.14.0 - 14,15 MB - Critico - Installato

- Intel Management Engine Components Installer - A04 - 318,11 MB - Critico - Installato

- Dell SupportAssist OS Recovery Plugin for Dell Update - A00 - 26,24 MB - Consigliato - Installato

- Dell Mobile Connect Driver - A00 - 10,59 MB - Consigliato - Installato

I suspected the problem was the BIOS so I downgraded to a previous version (1.13.1) but nothing changed. 

Do you have any suggestion?