First: I had to upgrade firmware. There is fn key in the place of right alt used to switch the devices, backlight, etc. As I’m using polish special characters, right alt is key (pun intended) for my everday life. I needed to use VIA app to remap keys, but it was not recognising my keyboard straight away. After 1,5 hour finally I’ve acomplished the mission. Let’s see what is next 🙃