so i bought a iphone 5 from craiglist. when I bought it, it was on the activation screen (connect to wifi n all) i had checked the imie before buying it. it was clean. i put my h20 sim card in it and connected to wifi. and it's asking for apple id of previous owner. it's on ios 7
I have no idea what is the user and pass for the previous owner. it's not letting me go inside the phone without putting that information in.

I tried to downgrade to ios6 but no luck. is there any way I can bypass that? or atleast downgrade it to ios6??