Any of the following things is needed:-
1. Owner number
3. medical ID
Note on medical ID screen contact number should be add like friend relatives etc.
After FMI get off do not activate from itunes/3utools,
Only Activate it by 3G/4G sim card and log in to icloud by own id 1st
Because if you activate by itunes/3utools device will be relocked and will ask previous owner apple iD and password