Cant upgrade Lg G3 to android 6.1

I currently have an LG G3 VS985 running Android 5.1.1. It was/is rooted with kingroot. I recently got the notification for android 6.1 update but i can't instal it. If I try it'll turn my phone off, back on and then once reaching 3% it gives me "Err : 0x1125000" then turns off and back on again

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