Scrambled channels


We have been using a vs8 open box for a few months. Yesterday my fiancé switched it off as the picture froze for ages and now all the channels are scrambled. I have tried searching for the channels again but they are still scrambled.

I honestly have no idea how this works. I have had a search on google but no luck with any fix yet.

Is there anything I can do or is it likely this won't work again? We don't have an aerial in our rented house.