Help...

I am trying to solve a problem with my Logitech K400+ wireless unify keyboard with mousepad. The / key has changed to the - position and a lot of function and symbol keys have changed places, and enter key does not work unless I hold down the Fn key at the same time. It is the last problem stopping me from a perfect experience with my Wechip android AOSP TV box which I just got today. Please help.