It took me a few hours to understand how to properly set this up. Simply put, you must use a web browser in ENGLISH to access the terminal Wifi setup menu (the text is not displayed if not, be it on Firefox, Chrome, Internet Explorer or Safari) .
Apart from this little quack at startup, the product works perfectly, the wifi coverage seems good (router upstairs, Cpl terminal wifi on the ground floor). You can even connect it via an ethernet cable (it can always help).