That is usually a message from the cable box , it may not matter that much. there are at least 16 formats and we only use a few right now.
compatibility is an issue when dealing with different brands , designs and constantly advancing technology. set the Tv format (aspect) to either full or 16x9 then set the cable box to 1080i only, and stretch.
I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771
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