I can not update my Lg G3 D851 android version

I get a notification to have an update of 6.0 when I see I click on install when phone turned off and installation start it gives error.I think it gives error because my phone is rooted.When I restart the phone I unrooted my phone and go to update center to reinstall update it says your phone is up to date and update notification disappeared then I go to check if my phone is updated or not it show 5.0.1 my phone is not updated.So tell me what is the cause of error and how can I get update notification back.And I know that my mobile update had come on 2nd of May 2016

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