Me neither Alexei 🙁
I think NOBODY in the world managed to connect his Slash to his Wi-Fi network.
Some people, including myself, managed to make it connect to their Wi-Fi network using a RJ45 cable (from the printer page in a web browser), but then no printer actually remembers the setting, and no printer ever connects to people’s SSID. Period.
I made an investigation over the Facebook user group: indeed nobody managed to make the Wi-Fi work.
Uniz acts as if the problem did not even exist, and there is a known solution like their useless www_fix program, but there is really not.