R6300 firmware

Hi folks, i've got the original R6300. 

I was browsing on the website for firmware update, and found updates for the V2 and V1. 

I can't remember, is my router the V1 by default, or does it have to say this on the label? Mine simply states Model: R6300 both on the sticker and GUI. 

Current firmware: V1.0.2.78_1.0.58

Thanks,

Andrew