updating my LG G4 Beat OS to 6.0 marshmallow

Hi,
      my phone is Lg G4 beat with Android version 5.1.1..


im trying to update from the update center and a message pops up saying: "You are usimg the latest software version for current OS"


I know that's now true because lots of peole have already updated their version with the same phone?
Any suggestion?


Please help.


Thanks!


I didn't find the right solution from the Internet.


References:

www.cnet.com/forums/discussions/updating-my-lg-g4-beat-os-to-6-0-marshmallow/



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