iPhone asks for Apple ID of previous owner which he forgot
Hello! 3 days ago I bought an iPhone 8 plus second hand when I received it I wanted to restore the factory settings to be like new, but the iPhone asked for Activation Lock as well as the Apple ID of the owner. I contacted him, but he told me that he had forgotten his Apple ID username and password .... My question is is there a way to start the phone? Please help!
[Re-Titled by Moderator]
iPhone 8 Plus, iOS 13