I'm sure if you search the forum you will find the answer, but to help you I give it to you.
1) try using the setup button. Push it for 30 seconds and you're in the hidden menu (first you see FM/AM). If that doesn't work
2) go to someone with a VCDS laptop and cable and he can read it from there.
Model: On top of your device it tells you which hardware version it is. It says something like 3T0035680A. The Last character shows you your hardware version, in this case it's an A version. The same info can be found in the hidden menu, if available.
You can use VCDS to read controller 37 or 56 to know the firmware version.
To activate the hidden menu (Testmode) using VCDS, go to controller 37 or 56 -->adaptation-->channel 50-->change value from 0 to 1-->test-->save
thank you mate,
i will try to get the VCDS cable this week and get back to you