htc one m8 software update

[AC Question]

I have a Sprint unlocked HTC one m8 mobile in India. Running on kit Kat 4.4.2 . But I am not receiving any software updates to lollipop. If I check for updates it is checking plongly but with no use. What should I do to update my Android device to Lollipop update. Please help me. Please say is it possible to get ota lollipop update after rooting the device. Please help. Thank you

 

[s misho]

Hmm I also have HTC One Me asking me to enter privacy protection after I removed the sim and replaced it back (same SIM Card). I can not remember my Anti-theft pin cord on google. How do I unlock it?