picture quality

hi, I've just changed my sky hd box for a zgemma box, its connected using a hdmi cable to my Denon AV receiver, but the picture quality is crap on sd compared to the sky hd box, is there any tweeking i can do to get the denon to upscale a better pic quality? i set the box to 1080i instead of 1080p as suggested on another post, just not sure if i should be altering anything on my denon to upscale to 1080p?
 
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