Follow this link: http://www.samsung.com/us/support/d...
to the TV's Firmware update page. Download the firmware that is available on that page and copy it to a USB thumb drive. Once on the Drive, double click the firmware to run it, which should unpack the firmware into the drive. Once unpacked, take the drive and insert it into the TV and select Update Software in the TV's menu.
To check what version you are running, enter the TV's menu, then navigate to the "Setup/System/Support" sub-menu. Once there, highlight "Software Upgrade" then press the "Info" button on the remote control. You should see the firmware version now on the screen.