Can I ask why you don't either:
A. Get the correct ecu
B. Use the correct file
?
Not being snarky, genuinely curious.
The ECU is the correct one for the car to start with (BD). The file I've decided to work with is from a slightly newer model which has a few more maps for SOI, and actually has a switch for MAP/MAF, as opposed to the original one.
Imo it's easier to start with this file than update the old one. Same idea behind starting with the RS4 base map for stage 3 than continuing on with the S4 maps.