When your phone is charging (and there's an ad on it) in the top right corner there should be 3 little dots. Touch those dots and it should pop up an option to TURN OFF SMART CHARGE. Click it. I had ads on my lock screen, done 3 factory resets sets, ads would stay gone for awhile then pop back up. Cleared cache for internet, removed apps, installed pop up blocker etc. This is the only thing that fixed it. Hope that helps.
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