Recently I have bought a Panasonic DMP-UB900 UHD Bluray player and I have the bluray player comnnected to the STR-DN1050 receiver connected to a Briva KD-49X8500B TV. I have tried to play Planet Earth 2 in UHD 4K bluray disc but it only show 1080p and not the 4K video I was excepted. I have tried to connect the bluray player to the TV directly with the 2 HDMI cables I have and both play 4K video correctly as excepted(so not cable issue). I have also factory resetted the DN1050 (press holding power buttonfor 5 seconds) and the firmware is the latest. I wonder if I have connected the player incorrectly(BD/DVD HDMI port at the back) or there's a setting I have setup incorrectly.