How to restore an iphone (ioS 7) without having the apple id?

I fix iphone's but just got one in that requested me to turn off "Find my Iphone" but that requires me to have the apple ID password of which i do not have. Does anyone know a way to get around this? Apple won't help me because its not "my iphone" for security purposes.

You're going to have to ask the owner to type in the password. Sorry!