Bought a new Samsung s7 from the Internet....

....Aaaand it's rooted.

Where did you get it from ...
And no , online isn’t the answer

You can probably flash fresh stock firmware on it

@mac-aga
Bought online but from a local store.
Gonna return it tommorow.
Goddamn scammers

@electrineer
I could, but I didn't root it and did not expect to buy a rooted phone.

I bought a new, out of the box phone and what I got instead was a rooted-tampered with one.

They probably thought nobody will notice because people are tech-illiterate

@Chlodovechus You are right. Was the box sealed?

@electrineer
Sealed with the importer's warranty sticker

Solution: Don't buy S7.
(Yeah I know. ThE S7 hAS nOtHiNg tO Do WiTh ThIs.)