The original resolution is not displayed during data disc video playback even when Output Video Resolution or Output Video Format is set to Original Resolution.
The Original Resolution is not supported with data discs. Original Resolution is only available with DVD, Blu-ray Disc and UHD (Ultra HD Blu-ray Disc) media.
NOTE: Not all Sony Blu-ray Disc players or Sony Blu-ray Home Theater systems can play UHD(Ultra HD Blu-ray).
(These products released before 2016 is not compatible with UHD.)
To see if your unit can play UHD, check the specifications on the manual supplied with the product.