This page always lists the latest firmware (both production and any public betas that are available). They release new firmware fairly regularly, as required for disc compatibility fixes, bug fixes, or new features.

Depending on how long you've had it, there have been new firmware releases. The public betas are generally optional unless they offer something you want or need (quick compatibility fix for a new release, fix for a bug you've been bothered by). They are typically stable enough for use, but OPPO plays it safe and doesn't start using those versions on the players they sell. That's saved for the production firmware releases. It's good to stay pretty current with those releases.

If you have the BDP-83 connected to the Internet (as required for using BD-Live), you can turn "firmware notification" on and the player will tell you when new firmware is available and ask for permission to install it. Otherwise, check the site from time to time to see what's new. If you don't have a network connection to the player, I like the USB update procedure. It's a very good technique and easy to do - all you need is a USB memory stick.