Can I update my samsung s5 active to Marshmallow

[AC Question]

I have tried update using the option on the phone and keep getting that my phone is updated, however i would like to get Marshmallow.
Phone Details
Model Number:- SAMSUNG-SM-G870A
Android version:- 5.0
Built Number:- LRX21T.G87OAUCU1BOC5

 

[chanchan05]

If your carrier didn't push out the update then you're out of luck with regards to the official rout. You have to find unofficial ROMs.