Hi, I have a 2003 A6 me7.1.1 with a R box. I'm having problems flashing a new file in which I have added a SAI delete. I flashed this same ECU about a month ago. The ECU originally had a S box but I had heard about many problems with it and flashed it over to a R box. I was not able to write to the ECU on the car, but was successful after putting it on a hacked together bench setup.
I put together a more professional bench setup and tried flashing the ECU this morning. I was able to connect and see my ecu info but nefmoto is telling me a precondition has not been met, which is the immobilizer not being authenticated upon trying to read or write. I'm not sure what is going on because I was able to flash it fine last month and my bench harness seems to be all in order. Could the problem be related to my R box vs the original S box? I am going to try flashing the ECU connected to the car later on today but doubt it will work since it did not work the first time I tried.
My bench harness is set up like the following diagram, with a 2.2k resistor on pin 21 which allowed me to connect on my first hacked together bench setup.
