Thanks for the answer.
While searching on the internet, I have found same info than you
If you want to upgrade your GM 1 version, you need to ship it to graupner, and they will upgrade it by putting the V8 version.
Price is 20€
If you have a GM 2 version, you can upgrade it by yourself.
I am surprised to see that it is not possible. I have seen that physically, GM 1 and 2 are not the same.
Even though, verion 4.3 seems to works correctly ...
I will try it on the available motor I have : X11 17,5T
and the second one is a X12 10,5T (used in Toulouse track).
Cédric
