By increasing the picture size on a Bv7-40 to get rid of the occasional flash on Blu-ray at the bottom left you will upset the resolution . It can be seen on a test card , if you look at the small boxes with black and white horizontal lines these become blurred and go black , white & gray if you increase the size . This was demonstrated to me in Denmark at the factory , a border can applied to cover to outer few lines but will have to find out how to do it as I’ve forgot .

Richard