Originally Posted by george brown
Yup, unroot before update.
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I remember seeing a post here saying that even after unrooting, the update process noticed the rooting tracks so it didn't perform the update.
Maybe you'd better install CWM before unrooting.
Phone: LG L7 II P714
ROM: LG Stock 4.1.2
Recovery: CWM v126.96.36.199
Tweaks: Xposed (GravityBox, Greenify, App Settings, ClockColorChanger, All Notifications Expanded), Nova Launcher Prime