Hello! I got this tablet for a long time and I don't know how, but I broke it long ago by trying to factory reset it. I did so through its factory mode, or however it's called, and now it stays on this screen. (What it writes down there means "The deletion is performing"
From time to time the screen turns off and the tablet restarts, and it gives me the same message over and over again.
Actually took my time and reinstalled a custom ROM, but still I don't know what happened to it, maybe someone needs this. My tablet is a Lenovo A3000, and sorry for the downvote, I didn't know what it does.