choose Rb20 or Rb25 afm's is the same thing, so selecting RB25 AFM's is no problem
when you go SETTING, AIRFLOW, RB25, NEXt it should look like
0.64v 100%
1.28v 100%
1.92v 100%
2.56v 100%
and so on... The % is the correction to apply
why the f**k is yours 0??? are you sure your seeing it right?
take a photo with your phone please. if its 0% for any of them then something is horribly wrong or your tuner is a hack
if its 0 please take a photo. DO NOT change shit randomly, if its 0, leave it at 0, stop driving the car and go see a real tuner, erase and start again