can i get help to update my lg g flex 2 after i unrooted

[XANCERITH]

Ok so i was having some performance issues with a game. So i got a suggestion to root my phone. Well come oneclicroot my phone did not have a custom rom for it. Which they failed to mention upon rooting. So now i unrooted my lgg flex 2 sl996 an tried to install the update that was in my notifacations. Well it will download but then after restart an the android appears saying installing update it goes to error then i have to wait for it to reboot with no update