The cinavia is not an error. This means that Samsung suscpects that you dont have the proper licences to play that file.
Cinavia is a copy protection that is used in some Blueray movies, and this copy protection is not removed when the file is ripped from the BD disk.
If you play the file on a computer or some other media player that dont have cinavia protection enabled, then the file will play without problems.
I have a Samsung HT-D6750W, and the same problem apeared after a firmware update, think it happended between fw version 1012 and 1013.
There is no way to downgrade the firmware in these players, but some of them does support custom built firmware. After you get that custom firmware installed, the software will be more open. Then it will be possible to patch the needed files to bypass the cinavia.
But this is a complicated process which require a bit knowledge to linux. And doing stuff like that will involve a certain risk of bricking the device if you do it wrong, and it will certainly break any warranty.
But if you are still feeling comfortable with trying this, then go to the SamyGO and try to figure out if your model is supported or not. Here are a few links to help you get started. But before joining the forum and start asking questions, do read all the info in the wiki's and search for your questions in earlier posts first.
http://wiki.samygo.tvhttp://wiki.samygo.tv/index.php5/Patched_firmwarehttp://wiki.samygo.tv/index.php5/ExeDSP_modifications
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