Custom Logo when I turn on screen and possible root due to Dr.Fone App.

So I downloaded the Dr.Fone app to help recover some pictures I accidentally deleted. Afterwards, I realized it didn't recover anything and now it made my phone go sluggish and unresponsive. I deleted the app and phone is still sluggish. Also whenever I restart my cell phone, there is a custom with an unlock key on the screen. I looked online says the phone is possibly rooted. Any way to fix this and reverse everything?

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