A few days ago my Samsung Ble Ray Home Theatre HT-J5530K ask me for a firmware update Version 1015. Once it finished it and a also a re-start was done, when I triy to play any video from an USB drive or You tube or from Netflix, the Dolby Digital 5.1 Sound is not working any more and the sound is only Stereo, but If I try to play a DVD, it's sound in 5.1. Anybody knows what could have happened. Can I unisntall the new update if it's the reason of the problem. How can I do it?