How to bypass Activation Lock?

To be honest, it's technically a stolen phone I suppose. My brother found this perfectly functional iPhone on the ground someone must have dropped. It had a code for the lock screen and he managed to hack it to reset the phone to factory settings. Only the owner has Find My Phone activated so we can't set the phone up now because you need to log in with the owner's apple id and password to continue the process to get to where it's activated and you're on the home screen. I saw some videos on youtube on how to bypass it. But after reviewing comments before trying it, it said the process did in fact work, however the phone still wasn't 100% functional because they couldn't open any apps.
So all in all, anyone know how to bypass this and still have everything functional?

Why don't you just give the phone back like a decent human being?

Not possible to remove find my iphone without the users knowledge.
If your connected to internet or 3G that phone will be traceable so expect someone to come looking for it.
also its probably been locked by the phone provider.

Jailbreak is the only solution but that will be breaking the law.

IPhones are pinpoint traceable so expect a knock on the door from the LAW or the own reports it lost and has it bricked by apple either way your NOT going to be able to use it for long… Advice return it to it's owner, Think about it if you lost your iPhone you would want it back wouldn't you?

You need to jailbreak it. Then you will able to use it

You won't get past it, and any attempt to turn it on whether Wi-Fi or celltower will notify them of its location.