With version 5.3 (i belive his one first programable chips he made) was you had to unplug the MAT by the air filter, then you go back inside and turn on the AC and then it'd cycle through the numbers. It was more of a pain to get out and unplug it, but that's what i had to do before i got my chip updated.
-Just describing that you did have to use the A/C years ago to program the chips.-
-Adam