My HTC M8 dual sim does not have a software update option, how can I get it?

[AC Question]

my htc m8 dual sim does not an software update option

I bought a 2nd hand HTC m8 (India). The phone is from Dubai. After coming home , I checked for a lollipop update, but there is no option for an update.
I went in about phone, but there's nothing

 

[ETokuc]

Re: my htc m8 dual sim does not an software update option

Settings, About, Software update