[adzii_nufc]

Its hold and select app info as you've said in a previous post. However it won't work unless the ad shows a notification in the bar.

The rogue app is launching its adware at startup each time. Could manually Google each app for its reputation and people reporting similar issues.

That and a factory reset is about all I can think about without dumping the entire phone layout and details all over.

I'd start by binning cosmetic launcher apps. GoLauncher etc. Anything along those lines that affect App icons and Home screen layouts. Even apps that work as intended can still come bundled with Ads and Push Ads.

I'm curious what apps were uninstalled that helped the larger ads on their way to the bin. This could identify possible remnants they leave.

Appstore > my apps and games > all. A list of all that's ever been installed and everything still on there.

Can't guarantee anything but manually check all app permissions in settings>apps.