Remote Management

I have older iPad 4. I don’t hardly use it & a friend wanted to borrow it a couple hours. So I backed it all up to my iCloud & like factory reset it. He never did use it & gave it back. I tried to access & restore my iPad but it’s asking me for previous owners username & password to their Remote Management & I don’t know username or password & cannot contact previous owners who have Remote Management to have them remove their Remote Management. How do I get back into my iPad & all my data in it. It shows up on my iPhone 7 device.