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Root How to tell if your hero is already 2.1

I bought a Hero off of Ebay and I love it, but it's kind of laggy. I've read a lot of places that if you do the 2.1 update that it should fix it, but I don't want to do the 2.1 update if it already has it on there. Is there an easy way to find out if it already has the 2.1 update?

Thanks :)


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