10 
… FP2: Android 10: Fairphone OS / Fairphone Open 23.02.0-rel.0
But yes, it was the only Snapdragon 801 phone getting a Google certified Android 7 already … Fairphone 2 is the first and only Snapdragon 801 phone to get Android Nougat … so for the point being made it doesn’t matter much whether it was 9 or 10 in the end.