Mahesh Abnave

I have 32LB5820 Smart TV I have few questions: What OS it runs? webOS? Is there any upgrade available? If yes where do I find it? How to install it? Does anyone tried running Plex on it as can be seen in this video: Can it record video to external USB drive? Can I have 5.1 surround sound out from it? How can I change audio track of dual audio video that I play from my external hard drive using USB connection?