go to the setup menu, "General" tab or whatever, and then go to "Maintenance", and finally "Update"
It will show you what firmware you have, from there.
The Dolby Digital + track is good. Although, I think in my instance it lacks some bass. YMMV. I think it's most dependant on your setup, room, listening habits, etc.
I would be very surprised if it ended up being defective disks or misprints... There are parts of the movie that are Earth-Shaking and then there are parts you might expect to be, which aren't so much....
LG OLED65C6P / Marantz AV8801 / D-Sonic M2500 / Oppo BDP-103 / PS4 Pro
GR Research LS-9 / GR Research X-Voce / GR Research AV-1RS / Oppo PM-1