Video output display for zgemma h2s

Hi guys I'm having a bit of an issue with a zgemma h2s. I tested it on a samsung smart tv and works fine. But I need it to work on a sony bravia . When I connect to sony tv and turn it on the splash screen appears and says 720p. Now by the time the startup reaches 60 the splash screen disappears. I need to set the output on zegma but all I found was the models on the remote but still no sign of the splash screen coming back. Any help appreciated
 
Don't know what you atre running but on openatv press menu\setup\ video\ basic settings you make changes in there.
 
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