Tab2 won't allow factory reset, why?

[AC Question]

Tab2 won't allow factory reset

I got a used Tab2 (AT&T version) from a friend. It's been acting sluggish, so I went to do a factory reset. But it will not do it, whether I do it through the Settings menu, or by pressing the volume up + power combo.

During the process where I attempt to reset, this screen comes up with a red android logo with a pirate eye patch. It talks about "Rooting SuperSU", but when I run the Root checker app, it says that the device is not rooted.

So is it possible that it was partially done? Either way, how do I override the system & get back to a factory reset?

As a side note, I'm relatively tech savvy, but have never rooted a device before and reading about the process gives me a bit of a headache! ;-)

Thanks in advance for any advice!

 

[mdatx85]

Re: Tab2 won't allow factory reset

Here's the screenshot of the restart screen...