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Both the 1st and 2nd gen MotoX are on 5.1.

And how do I update? I went to System Update and it says "Your device's software is up to date."

[edit]

According to Sprint's website[1] 4.4.4 is the latest version.

not on Verizon :-(

Nor Sprint as far as I can tell. That covers about 190 million subscribers in the US.