hello, I have a question for uploading the ECU file to audi a8 d3 4.0 tdi, I use galletto v54, when I read ecu I get 2 files but when I need to upload a new file to ECU the program gives me the ability to mark only one file to load, this car have 2 ECU, master and slave,I didn't uploaded anything because I want to hear information from someone who has already worked with it and to be sure that I will not create a problem and kill the ECU. I use EOBD 2 2012 as software.