How to tell what OS is on your 2500?

I think my machine had the original OS from back in the day. I just bought this unit used. Is there a way to tell what OS is currently installed on your machine? Manual says nothing about.

Any help would be great.

mode -> pad10

peace jo

Damn yo. Vs. 1.00B

JJos for sure

Thanks for the help

I think thats still the OG OS. The JJ OS is 3.8 and higher I do believe. Someone correct me if I am wrong.