You mean besides the detailed wiki post about 
Using TWRP on the Fairphone 2? 
One important step is to boot directly into TWRP after flashing it. Don’t boot into Android first, this might restore stock recovery.
You mean besides the detailed wiki post about Using TWRP on the Fairphone 2?
One important step is to boot directly into TWRP after flashing it. Don’t boot into Android first, this might restore stock recovery.