How to Erase All Content and Settings on iPhone 4 w/out Apple ID pass?

I let my ex best friend use my old iPhone 4 for about a year. When I got it back I tried to Erase All Content and Settings, but she incidentally doesn't remember the password to her Apple account. I've done Reset All Settings and there are still a bunch of pictures and other things on the phone I can't delete. Is there any way to Erase All Content and Settings without her password? All help is greatly appreciated.

Nope, for obvious security reasons. You'd have to get the password for it to be erased.

If it is updated past ios8 then you can't erase all content without the apple id/ icloud password. This is a new security feature by apple that prevents people from erasing the content on an iphone that they find/steal so they don't try to resell it or use it as theirs

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