iPhone 7 Plus is locked by owner after updating

Contact the previous owner for assistance or seller if

not same person.

There is no workaround for the security features of Activation Lock.

Activation Lock page: https://al-support.apple.com/#/getsupport

Without the AppleID and passcode used to initiate the Activation Lock,

the iPhone will remain useless to you. Recycle it responsibly if you cannot

get the seller to give you a refund.