Help to bypass iCloud activation in iPhone 4s?

I bought an iPhone 4s from a guy for a low price and then i upgrade it to ios 8. Now they 're asking me apple id and password so i asked the owner he said he forgot even the apple id. I tried out many methods to bypass but none of them work due to ios 8 and i can't downgrade to ios 7 now because apple stopped supporting downgrading.Is there any way to bypass, I tried to find DouCI too but can't find an active link most of them are spams.
Help i really need to bypass now that the owner won't take back the phone.

Added (1). Please don't put up u scam websites and surveys.

As far as I'm aware there's no way around the apple ID

more than likely your guy stole the phone - noone forgets their apple ID

anyway

now you own a neat bundle of spare parts

unless

you can get the guy to take it back

if bought through ebay you could likely get a refund via paypal. They are quite good on misrepresentation

There's no way, this is why it is in place.

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