you have to find them on your computer i saved mine to the desktop so i know exactly where they are, ive got the esp fault aswell with bluefin and k&n i dont get management light but i know its my airflow meter gone, if its just esp light showing the bluefin wont read it untill the management lights up
connect the bluefin then left side of the my bluefin there should be a symbol like 3 windows together click that then find your maps click should then open another box and say stage 1 2 3 3+ click which ever you want then should load on the handset
update the bluefin desktop to the latest version .
the click on the little cog button and browse to the map files you downloaded off the forum. one is a .mod file the other is a .bin file. You have to unzip them first!
im going to write an updated how to version very soon!