really no one can give a hint? i've tried a bunch of maps and can't figure if this is DSG related or has something to do with ABS pump.

thank you bro, i've already found that and pretty much used the configuration from a DSG that I know the LC works, still nothing.

Since the car is an A3 8L and never had dsg, i was thinking it got something to do with the abs pump because when I try to activate the launch (foot on brake, accel, ESP off - it's not really working so it's always off, maybe this an issue too, DSG in S or TT), the car wants to start but not in the same way as a GOLF 5 GTI DSG for example: but it pushes the Brake Pedal back (like big backpressure on brake).

I'm looking for advice on where to look first, because I already tried like 10-15 DSG gearbox software configuration and still nothing.

Many thanks!

Yes sir, I did check:
Gearbox selector in Sport - OK
ESP OFF - always if off
hand brake off - YES
 accelerator pedal to the floor - Yes
brake pedal pushed - hardly pushed but told you before it pushes back when I fully press the accelerator.

also, gearbox is working fine in everyother condition, like gear changes and etc. Car was on optimal temps so temp was not an issue. Gearbox is seeing ECU torque.

could it be because the car speed sensor is not floating on can properly?

By default the DSG is looking for a brake pressure of 20 bar to start LC and less than 7 bar to release and launch