Hi All. New on this forum and this is my first topic listing immediately a problem I'm having. Basically we have a beautiful C6 2006 model at our shop and we had to change the TCM module. This was bought from Poland (Europe) as I live in Malta ( Europe also) as they were the only company who could supply us this module. First I made a backup of the old TCM module using the Hp tuners hardware. When I went to upload it on the TCM it says that OS versions are different. I used write Entire mode but unfortunately the ECU didn't communicate with TCM. I reverted back to the stock file the TCM came with but it's stays on LIMP mode. Now I wanted to ask, is there A way I can upload a correct OS file on bought ECM and TCM so they could communicate with each other. I know that there are special diagnostic tools like tech2 that can be used for this job but unfortunately here in Malta there is no one that can help me.