How to restart a iphone 6 completely?

Hey everyone can you help me? I found this iPhone 6 just laying on a bench. And when i found it and turned it on it asked for the old icloud information. If anyone can send a video or a list of steps of how to get rid of that or completely just reset the phone completely please take the time to help me out thank you!

There's no way. It's basically an iPhone brick unless the owner unlocks it via password

Here's a novel idea; how about you look on the top left of the screen, see who the carrier is and take it to the nearest store the carrier has and they can turn it over to the rightful owner

What you have there's an iCloud Lock. I'm not gonna be one of those who says to hand it into the police etc but an iCloud Lock is impossible to bypass, it's an anti-theft feature so obviously if you could bypass it then what would be the point in even having it? The phone is nothing but an expensive paperweight until the original owner enters their details.

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