make sure your on the sys info screen - menu - 6 - 1 - 3 on your remote.
pretty sure that is where you are so..
beside where it says software version, that is your current firmware version.
it doesn't just say 2.xx it will be something like 2xxxxx-N or something... but you should be able to figure it out.. i'm not around the 811 right now to get more specific.