Default [Q] I don't have the option to update, what to do?

I got myself an HTC one m7 last week. It was running on android 4.2 and sense 5.0.

I wanted to update it so went to Settings>About phone. There was no option to update. I've attached a screenshot. A friend of mine asked i should install a ruu file but i can't find a suitable one for my phone. it's the hongkong version of HTC one m7 UL. What should I do to update the phone?

And i am having some mic issues too. Some people who i talk on phone can't hear what i am saying properly. Some forums suggested that it gets fixed when the os is updated
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