how can i get my ONN freeview box to work? model no:-OSTB01?

my ONN freeview box seems frozen or is not working properly.
it was working ok until 2 weeks ago.

the standby light comes on (usually) but i cannot get
any digital, or terrestrial channels through the box

i can receive terrestrial channels through my tv so i don't think there is anything wrong with the aerial

i have had the box for just over a year, (from Asda) and i very unhappy with it not working