How to remove iPhone 6 Activation Lock when previous owner has forgotten details?

Activation lock is a security protocol that can't be bypassed. Only the person it is locked to can unlock it.

If you bought this from someone and it came locked, try to get your money back, you will never be able to use the phone.

The All Too Common SAD Reality of Buying a used phone -

https://discussions.apple.com/docs/DOC-250001038

Nothing.

only the person who originally setup the phone can remove activation lock.

Get your money back.

Kasabwata1 wrote:

how to remove activation lock when previous owner has forgotten details on iPhone 6.

You don't.

what do i do

If you can't get your money back, you toss it in the nearest electronics recycling bin and take this as a life lesson in buying used Apple products.

what do i do

You try to get your money back. Unfortunately, "previous owners" have a way of disappearing once they have your money.

999,999 times out of a million the seller says they "forget" their own credentials, they're lying. They never knew them to start with because it's a stolen item.