What I meant was if the ECU was ever flashed with the APR trial software, you would not be able to tell but APR's code would still be on there.
Anyway, I'm confused you have a 2002 Tip S4 (AA box) that you are trying to run a 2000 A6 (K box) ECU in with 2001.5 6 speed S4 (M box) software?
Can you more clearly list the details of the car (year, make, model, transmission, original ECU), ECU you are flashing, software you are flashing, and method (bench or in car)?
my aa box came off my 01.5 a6 6 speed, stock as shit. apr nothing ever used. i know aa's are also for a 02 tip s4 but they are different part numbers both ending in AA
here:
http://forums.vwvortex.com/showthread.php?5051544-F.S.-01-A6-2.7T-ecui know not much proof by what some guy says but i have the same ecu.
anyway this is my stock ecu (the aa), i have a spare k box from my wifes 00 a6 6 speed i was trying to flash for my 01.5 a6 while i stiill have the AA in it. buttttttttt i cant get the k box to flash apparently on the bench, it says it cannot validate the memory layout (i tried 29F800BB and 29F800BT, which i read you use for a6/s4). so if i can get that to work thats fine and dandy.
so i tried to hook up the AA box (my stock untouched 01.5 ecu) on the bench and i am getting a immobilizer message from nefmoto saying it needs to be turned off. from what i read it needs to be put into boot mode, or it can be flashed with the ecu installed in the car to get around turning off the immobilizer.
i dont give a shit which one works, as long as i can flash either one of these to work. so imma try to flash AA box on the car now and see what happens.